scholarly journals P- T PATH RECONSTRUCTION IN NEOPROTEROZOIC GARNET-BEARING PARAGNEISSES FROM A METASEDIMENTARY SUCCESSION OF THE SOUTH WESTERN ARAÇUAÍ OROGEN, MINAS GERAIS, BRAZIL

2015 ◽  
Author(s):  
Reik Degler ◽  
Tiago Amâncio Novo ◽  
Bernhard Schulz ◽  
Gláucia Nascimento Queiroga
Keyword(s):  
Granulite Facies ◽  
Minas Gerais ◽  
Maximum Temperature ◽  
Maximum Pressure ◽  
The South ◽  
Garnet Porphyroblasts ◽  
Magmatic Arc ◽  
Basement Rocks ◽  
T Path ◽  
Araçuaí Orogen

Abstract: This paper focuses on pressure- and temperature path analyses in paragneisses from a metasedimentary succession (MSS) in the south western Araçuaí orogen. The sampling area is limited by the Abre Campo shear zone (West) and the Rio Doce Magmatic Arc (East). This region is rich in ortho-derived metamorphic basement rocks (Mantiqueira and the Juiz de Fora complexes) and para-derived metamorphic rocks, including paragneisses interlaid by quartzites, which form the MSS. The sampled rocks are mainly compost of quartz, plagioclase, garnet, K-Feldspar, orthopyroxene and sillimanite. Measurement spot profiles through garnet porphyroblasts show a certain zonation characterised by decrease in pyrope and the increase in almandine from the core to the rim. This implies retrograde growth. Metamorphic conditions are of high amphibolite- to granulite facies with maximum pressure of ca. 6 kbar and maximum temperature of ca. 700°C. The data suggest that the cores of the garnet porphyroblasts of MSS started to grow during the final deformation stage of the Araçuaí orogen (south western part); the event of decompression is captured in the rims of the porphyroblasts and related to the gravitational collapse in the Cambrian. Keywords: P-T path, metasedimentary succession, geothermobarometry, Araçuaí orogenResumo: RECONSTRUÇÃO DE TRAJETÓRIAS P-T EM PARAGNAISSES GRANADÍFEROS NEOPROTEROZÓICOS DA UMA SUCESSÃO METASSEDIMENTAR NO SUDOESTE DO ORÓGENO ARAÇUAÍ, MINAS GERAIS, BRASIL. Este estudo foca analises de caminhos de pressão e temperatura em paragnaisses de sucessão metassedimentar (SMS) da região sudoeste do Orógeno Araçuaí. A área de amostragem é limitada pela zona de cisalhamento de Abre Campo a oeste e pelo Arco Magmático Rio Doce a leste. A região é rica em rochas metamórficas de alto grau ortoderivadas (complexos Mantiqueira e Juiz de Fora do embasamento) e paraderivadas; incluindo paragnaisses intercalados a quartzitos, que formam o SMS. As rochas amostradas são compostas por quartzo, plagioclásio, granada, feldspato potássio, ortopiroxênio e sillimanita. Perfis de pontos de análise em porfiroblastos de granada mostram certo zoneamento caracterizado pela redução de piropo e por aumento de almadina do núcleo para borda; isto implica em crescimento de cristal sob condições de metamorfismo retrógrado. Condições metamórficas são de fácies anfibolito alto a granulito com um máximo de pressão de ca. 6 kbar e com temperatura máxima de ca. 700°C. Os dados sugerem que porfiroblastos de granada da SMS têm nucleação e início de crescimento durante o final da etapa deformacional principal compressiva do Orógeno Araçuaí (região sudoeste do orógeno); o evento de descompressão captado em bordas dos porfiroblastos foi relacionando ao colapso gravitacional no Cambriano. Palavras-chave: Trajetórias P-T, sucessão metassedimentar, geotermobarometria, Orógeno Araçuaí

scholarly journals PYROXENES AND THE P-T PATH IN GRANULITE FACIES OF SW MINAS GERAIS, BRAZIL

1997 ◽  
Vol 27 (1) ◽  
pp. 49-52 ◽  
Author(s):  
ASIT CHOUDHURI ◽  
SUNDARAM S. IYER ◽  
JOSÉ RENATO NOGUEIRA
Keyword(s):  
Granulite Facies ◽  
Minas Gerais ◽  
T Path

scholarly journals GEOLOGIA DA REGIÃO DE JEQUERI-VIÇOSA (MG), ORÓGENO ARAÇUAÍ MERIDIONAL

2013 ◽  
Author(s):  
Daniel Tavares Gradim ◽  
Gláucia Nascimento Queiroga ◽  
Tiago Amâncio Novo ◽  
Carlos Maurício Noce ◽  
Antônio Carlos Pedrosa-Soares ◽  
...  
Keyword(s):  
Partial Melting ◽  
Shear Zone ◽  
Granulite Facies ◽  
Minas Gerais ◽  
Amphibolite Facies ◽  
Ultramafic Rocks ◽  
Metamorphic Rocks ◽  
The West ◽  
Minas Gerais State ◽  
Araçuaí Orogen

RESUMO: A característica fundamental da região de Jequeri-Viçosa, situada no extremo sul do Orógeno Araçuaí, é a abundância de rochas metamórficas, ortoderivadas e paraderivadas, de fácies anfibolito alto e granulito. O embasamento paleoproterozóico é representado, a oeste, por ortognaisses tonalíticos a graníticos do Complexo Mantiqueira e, a leste, por ortognaisses charno-enderbíticos do Complexo Juiz de Fora. Ambos os complexos incluem anfibolitos e exibem intensidades variáveis de migmatização. O contato entre eles é marcado pela zona de cisalhamento transpressiva destral de Abre Campo, interpretada como uma sutura paleoproterozóica reativada no Neoproterozóico. O Anfibolito Santo Antônio do Grama e rochas meta-ultramáficas associadas (Córrego do Pimenta) representam restos ofiolíticos ediacaranos, colocados ao longo da Zona de Cisalhamento de Abre Campo. Assentada sobre o embasamento, na parte oeste da área, ocorre uma associação metavulcano-sedimentar neoproterozóica do Grupo Dom Silvério, composta por xistos diversos e quartzito. Na porção leste da área mapeada, a cobertura metassedimentar neoproterozóica é atribuída ao Grupo Andrelândia que inclui paragnaisse migmatítico e raro quartzito. Corpos de hidrotermalito quartzoso, indiscriminadamente associados às unidades do embasamento e da cobertura neoproterozóica, ocorrem ao longo de zonas de cisalhamento. Hidrotermalitos ferruginosos associam-se ao Complexo Mantiqueira na Zona de Cisalhamento de Ponte Nova. O granito foliado a milonitizado da Serra dos Vieiras parece ser um produto de fusão parcial do paragnaisse Andrelândia. Completam o quadro geológico os pegmatitos da Suíte Paula Cândico e diques de diabásio mesozóicos.Palavras-chave: Paleoproterozóico, Neoproterozóico, Orógeno AraçuaíABSTRACT: GEOLOGY OF THE JEQUERI-VIÇOSA REGION, MINAS GERAIS STATE, SOUTHERN ARAÇUAÍ OROGEN. This paper focuses on the southwestern sector of the Araçuaí orogen in a region located close to the boundary with the northern Ribeira orogen. This region is rich in ortho- and para-derived metamorphic rocks of the high amphibolite and granulite facies. The Paleoproterozoic basement includes, to the west, tonalitic to granitic orthogneisses of the Mantiqueira Complex and, to the east, enderbitic to charnockitic orthogneisses of the Juiz de Fora Complex. Both complexes also include amphibolite enclaves and show several rates of partial melting. The contact between them is marked by the dextral transpressional Abre Campo shear zone, considered to be a Paleoproterozoic suture reactivated during the Neoproterozoic Era. The Santo Antônio do Grama Amphibolite and associated meta-ultramafic rocks (Córrego do Pimenta) are Ediacaran ophiolite slivers emplaced along the Abre Campo shear zone. In the western part of the region, the Paleoproterozoic basement is locally covered by a metavolcano-sedimentary assemblage composed of amphibolite facies schist and quartzite of the Neoproterozoic Dom Silvério Group. To the east, the Neoproterozoic cover comprises the migmatized paragneiss and rare quartzite of the Andrelândia Group. The Serra dos Vieiras foliated to mylonitic granite seems to be formed from the partial melting of the Andrelândia paragneiss. Pegmatites of the Paula Cândido Suite and Mesosozic diabase dikes complete the geologic framework of the mapped area.Keywords: Paleoproterozoic, Neoproterozoic, Araçuaí Orogen

scholarly journals Field work between Fiskefjord and Godthåbsfjord, southern West Greenland

1984 ◽  
Vol 120 ◽  
pp. 45-50
Author(s):  
A.A Garde
Keyword(s):  
Granulite Facies ◽  
Field Work ◽  
Precambrian Basement ◽  
The South ◽  
West Greenland ◽  
Basement Rocks ◽  
Logistic Support

The 1980-1981 field work in Precambrian basement rocks for the Fiskefjord map sheet was continued in 1983. V. R. McGregor mapped granulite facies gneisses south of outer Fiskefjord in the south-western part of the map sheet area. The author worked inland between Godthåbsfjord and Fiskefjord from the eastern map sheet boundary at 50°54'E westwards to 51°45'E (fig. 22) and some notes concerning the lithologies, geometry and geochronology of this area are presented below. The GGU cutter K. J. V. Steenstrup and a Jet Ranger helicopter on weekly charter from Godthåb provided logistic support for the two Fiskefjord teams and for four teams mapping in the Ivisårtoq area (see Brewer et al., this report) as well as for the GGU glaciological station at Qamanârssûp serrnia.

Multistage growth and reworking of the Palaeoproterozoic crust in the Bergslagen area, southern Sweden: evidence from U–Pb geochronology

2006 ◽  
Vol 143 (5) ◽  
pp. 679-697 ◽  
Author(s):  
ULF B. ANDERSSON ◽  
KARIN HÖGDAHL ◽  
HÅKAN SJÖSTRÖM ◽  
STEFAN BERGMAN
Keyword(s):  
Granulite Facies ◽  
Amphibolite Facies ◽  
Thermal Activity ◽  
The South ◽  
Magmatic Arc ◽  
Metasedimentary Rocks ◽  
The North ◽  
South Central ◽  
Augen Gneiss ◽  
A Minor

The Svecofennian Domain of the Fennoscandian Shield constitutes a considerable volume of Palaeoproterozoic crustal growth, 2.1–1.86 Ga ago, in between the Archaean craton in the NE and the 1.85–1.65 Ga Transscandinavian Igneous Belt (TIB) in the south and west. The Bergslagen area is a classical ore province located in the southwestern part of the Svecofennian Domain of south-central Sweden. Its northern part is dominated by volcanic and plutonic rocks of a magmatic arc with continental affinity, while the SE part is made up by a sedimentary basin. The Bergslagen area shows a metamorphic zonation from lower to middle amphibolite facies in the north to upper amphibolite facies and locally granulite facies in the south; a small greenschist area exists in the west. Identifying the age spectra of inherited components, magmatic crystallization, as well as metamorphic episodes, provide important constraints on the geodynamic evolution of this centrally located piece of the Shield.U–Pb zircon SIMS data presented in this paper complement the previous, regionally scattered TIMS data from this area. Magmatic zircons from two felsic metavolcanic rocks and two amphibolites (metagabbros) yield 1888±12, 1892±7 and 1887±5, 1895±5 Ma, respectively; i.e. within the 1.91–1.86 Ga range previously obtained for Early Svecofennian magmatism in Bergslagen. An augen gneiss from southern Bergslagen, assigned to the earliest TIB generation, yield an intrusive age of 1855±6 Ma. Metamorphic monazites from the same rock indicate that deformation and elevated thermal activity prevailed 1.83–1.82 Ga ago (TIMS). Metamorphic zircons in high-grade metasedimentary rocks from the south and west yield ages of 1793±5 and 1804±10 Ma, in accordance with ages for regional peak metamorphism and migmatite formation found elsewhere in the southern Svecofennian province of Sweden. More importantly, a few zircon crystals and overgrowths in rocks from the north indicate an early metamorphic episode at c. 1.87 Ga, indicating that Bergslagen has experienced two major metamorphic events. Detrital and inherited zircons span the range 2.78–1.90 Ga, with an apparent gap at 2.45–2.1 Ga, which further emphasize previous observations of a major juvenile (<2.1 Ga) and a minor Archaean provenance. This, and in particular the 1.94–1.91 Ga crystals present in the c. 1.89 Ga amphibolites, support the suggestion of a former Palaeoproterozoic pre-1.91 Ga crust in the Bergslagen area.

scholarly journals Age, provenance and tectonic setting of the high-grade Jequitinhonha Complex, Araçuaí Orogen, eastern Brazil

2016 ◽  
Vol 46 (2) ◽  
pp. 199-219 ◽  
Author(s):  
Tatiana Gonçalves Dias ◽  
Fabrício de Andrade Caxito ◽  
Antônio Carlos Pedrosa-Soares ◽  
Ross Stevenson ◽  
Ivo Dussin ◽  
...  
Keyword(s):  
Detrital Zircon ◽  
Tectonic Setting ◽  
Granulite Facies ◽  
Major And Trace Elements ◽  
Passive Margin ◽  
Published Data ◽  
The North ◽  
Basement Rocks ◽  
Data Yield ◽  
Araçuaí Orogen

ABSTRACT: The Jequitinhonha Complex of the northeastern Araçuaí orogen is an extensive sedimentary unit metamorphosed in the amphibolite-granulite facies transition around 580-545 Ma. The unit consists of Al-rich (kinzigitic) paragneisses with decametric intercalations of graphite gneisses and quartzites, and centimetric to metric lenses of calcsilicate rocks. A new detrital zircon U-Pb age spectrum is reported for a sample of quartzite, and whole-rock geochemical (major and trace elements, 9 samples) and Sm-Nd isotope data (10 samples) for Jequitinhonha Complex paragneiss. Together with published data these show that: (1) the geochemistry of paragneiss samples of the Jequitinhonha Complex are similar to those of passive margin sedimentary protoliths; (2) detrital zircon data yield U-Pb age populations between ca. 0.9 and 2.5 Ga; and (3) Sm-Nd TDM model ages range from 1.6 to 1.8 Ga and εNd(575 Ma) around -7.5. The data reveal a mixture of Cryogenian to Mesoproterozoic rift-related igneous rocks with the Palaeoproterozoic-Archaean basement rocks of the São Francisco-Congo palaeocontinent as the main source areas, and also support the correlation between the Jequitinhonha Complex and the passive margin units of the upper Macaúbas Group, constituting the precursor basin of the orogen. Our results, with the absence of ophiolites in the Jequitinhonha Complex, reinforce the interpretation that the São Francisco-Congo palaeocontinent was not divided to the north of the focused region, suggesting an ensialic termination of a gulf during the Neoproterozoic.

scholarly journals O EMBASAMENTO ARQUEANO E PALEOPROTEROZÓICO DO ORÓGENO ARAÇUAÍ

2013 ◽  
Author(s):  
Carlos M. Noce ◽  
Antônio Carlos Pedrosa-Soares ◽  
Luiz Carlos da Silva ◽  
Fernando F. de Alkmim
Keyword(s):  
Greenstone Belt ◽  
Granulite Facies ◽  
Crustal Material ◽  
Granite Pluton ◽  
Magmatic Arc ◽  
Quadrilátero Ferrífero ◽  
Arc Setting ◽  
Brasiliano Orogeny ◽  
Araçuaí Orogen ◽  
Archean Basement

O embasamento do Orógeno Araçuaí compreende essencialmente os complexos Guanhães, Gouveia, Porteirinha,Mantiqueira e Juiz de Fora. Os quatros primeiros possuem caráter autóctone a para-autóctone erepresentam o embasamento cratônico retrabalhado no domínio orogênico. O Complexo Juiz de Fora estátectonicamente justaposto ao Complexo Mantiqueira por meio de extensa zona de cisalhamento neoproterozóica,a Falha de Abre Campo. Os complexos Guanhães, Gouveia e Porteirinha assemelham-se ao arcabouçoarqueano do Quadrilátero Ferrífero, incluindo gnaisses e migmatitos TTG (tonalito-trondhjemito-granodiorito,plutons graníticos e seqüências do tipo greenstone belt. As idades conhecidas de eventos e unidadesgeológicas, entretanto, não são perfeitamente correlatas àquelas do Quadrilátero Ferrífero. No ComplexoGuanhães os gnaisses/migmatitos TTG foram datados entre 2867 e 2711 Ma, e um corpo granítico em 2710Ma. No Complexo Gouveia ocorre uma sequência greenstone belt de 2971 Ma, e uma intrusão granítica foidatada em 2839 Ma. Datações U-Pb não estão disponíveis para o Complexo Porteirinha.O Complexo Mantiqueira é composto predominantemente por ortognaisses bandados, cuja cristalização magmática ocorreu no intervalo 2180-2041 Ma. Os dados isotópicos de Sr e Nd sugerem uma origem porprocessos de fusão de crosta continental antiga. Já os ortognaisses granulíticos do Complexo Juiz de Fora possuem assinatura isotópica dominantemente juvenil e cristalizaram entre 2134 e 2084 Ma. A associaçãode rochas do Complexo Mantiqueira corresponde a arco(s) magmático(s) desenvolvido(s) sobre a margem do paleocontinente arqueano, enquanto o Complexo Juiz de Fora parece representar um arco intra-oceânico.Estes complexos constituem segmentos de um orógeno riaciano, desenvolvido entre 2,2 e 2,05 Ga, e retrabalhado pela Orogenia Brasiliana.Abstract: Basement units of the Araçuaí Orogen are the Guanhães, Gouveia, Porteirinha, Mantiqueira, and Juiz deFora complexes. The first four units are autochthonous to parautochthonous, and are considered to be thereworked margin of the São Francisco Craton, now located in the Araçuaí Orogen. The Juiz de Fora complexis juxtaposed against the Mantiqueira complex by a dextral-reverse, high-angle shear zone of Brasilianoage (the Abre Campo Fault). The Archean basement of the Quadrilátero Ferrífero region can be traced intothe Guanhães, Gouveia, and Porteirinha complexes, which display TTG gneisses and migmatites, graniteplutons and greenstone belt sequences. However, ages of geologic units and events are not exactly thesame as in the Quadrilátero Ferrífero. TTG gneisses within the Guanhães Complex yielded magmatic ages between 2867 and 2711 Ma, and a granite pluton was dated at 2710 Ma. A greenstone belt sequence and agranite pluton of the Gouveia Complex were dated at 2971 Ma and 2839 Ma, respectively. U-Pb ages arenot available for the Porteirinha Complex.The Mantiqueira complex consists predominantly of banded biotite-amphibole orthogneiss, with magmaticages at 2180-2041 Ma. Sr and Nd signatures suggest that the gneiss protholits were essentially generatedby partial melting of crustal material. On the other hand, granulite facies orthogneisses of the Juiz de ForaComplex make up calc-alkaline suites of juvenile affinity, and crystallized at 2134-2084 Ma. The MantiqueiraComplex is a magmatic arc built up along the Archean margin of the São Francisco Paleocontinent, whilstthe Juiz de Fora Complex probably evolved within an oceanic magmatic arc setting, or on a very stretched continental crust. They are envisaged as segments of a Rhyacian orogen that evolved at 2.2-2.05 Ga, latter reworked by he Brasiliano Orogeny.

scholarly journals TERMOBAROMETRIA DE METAPELITOS GRANADÍFEROS DO GRUPO RIO DOCE, ORÓGENO ARAÇUAÍ

2015 ◽  
Author(s):  
Tiago Amâncio Novo ◽  
Antônio Carlos Pedrosa Soares ◽  
Reik Degler ◽  
Bernhard Schulz
Keyword(s):  
Early Paleozoic ◽  
Magmatic Evolution ◽  
Garnet Porphyroblasts ◽  
Magmatic Arc ◽  
Deformation Phase ◽  
Increasing Temperature ◽  
T Values ◽  
Araçuaí Orogen ◽  
Main Deformation ◽  
Silicate Rocks

O Grupo Rio Doce consiste numa unidade metavulcanossedimentar dominada por metapelitos e metawackes, com intercalações de rochas calciossilicáticas, metavulcânicas e metavulcanoclásticas que gradam para pacotes quartzíticos no topo. Caracteriza bacia relacionada ao Arco Magmático Rio Doce – Orógeno Araçuaí – com gênese e metamorfismo associados à Orogênese Brasiliano/Pan Africano. O conjunto de metapelitos da base do Grupo Rio Doce possui paragênese granadífera cristalizada durante fase deformacional principal (ca.570Ma). Os porfiroblastos de granada mostram perfis de zoneamento de Fe-Ca-Mg-Mn bem desenvolvidos caracterizados por aumento de almandina e piropo e redução dos termos grossulária e espersartita do centro para borda. Os valores P-T calculados para núcleo e borda das granadas descreve um trend de sentido horário, envolvendo aumento de temperatura (de ca. 450°C para 580°C) sob descompressão (de ca. 8.0kbar para 5.8kbar). Tal desenvolvimento pode estar associado à fase deformacional principal do Orógeno Araçuaí com descompressão e aumento da temperatura associados à quebra da placa subductada.Palavras-chave: Orógeno Araçuaí, Grupo Rio Doce, metapelitos granadíferos, geotermobarometria. Abstract: THERMOBAROMETRY OF GARNET METAPELITES FROM RIO DOCE GROUP, ARAÇUAÍ OROGEN. The Rio Doce Group consists of a metavolcanosedimentary unit composed by metapelites and metawackes interlayered with calc-silicate rocks, metavolcanic and metavolcaniclastic harrowing to quartzite packages at the top. It’s an arc-related basin associated to the Rio Doce magmatic arc – Araçuaí orogeny- that underwent metamorphic and magmatic evolution during the Neoproterozoic–Early Paleozoic time. The garnet-bearing assemblages crystallized in course of the deformation stage which led to the formation of the main foliation at ca.570 Ma. The garnet porphyroblasts display well developed growth zonation of Fe-Mg-Ca-Mn and are characterized by an increase of almandine and pyrope while grossular and spessartine decrease from core to rim. The P-T values calculated from cores and rims of garnets align along clockwise trends, involving an increasing temperature (from ca. 450°C up to 580°C) under decompression conditions (from ca. 8.0kbar to 5.8kbar). Such development may be linked to the Araçuaí orogen main deformation phase with decompression and temperature increased associated with a slab-breakoff.Keywords: Araçuaí orogen, Rio Doce Group, garnet metapelites, geothermobarometry.

The Late Cretaceous magmatic arc of the south Aegean: Geodynamic implications from petrological and geochemical studies of granitoids from Anafi island (Cyclades – Greece)

2021 ◽  
pp. 1-24
Author(s):  
Petros Koutsovitis ◽  
Konstantinos Soukis ◽  
Panagiotis Voudouris ◽  
Stylianos Lozios ◽  
Theodoros Ntaflos ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
The South ◽  
Magmatic Arc ◽  
Geochemical Studies

A garnet peridotite and a garnet-amphibole pyroxenite from South Harris, Outer Hebrides, and their bearing on the South Harris eclogite facies status

1967 ◽  
Vol 36 (279) ◽  
pp. 380-388 ◽  
Author(s):  
A. Livingstone
Keyword(s):  
Optical Properties ◽  
Granulite Facies ◽  
Garnet Peridotite ◽  
Ultramafic Rocks ◽  
Chemical Analyses ◽  
The South ◽  
Outer Hebrides ◽  
Eclogite Facies

SummaryA garnet-olivine metaperidotite and a garnet-amphibole pyroxenite are described. Chemical analyses are presented for six rocks and optical properties and chemical analyses are tabulated for clinopyroxene, almandine-pyrope garnet, and hastingsitie amphibole from the garnet-amphibole pyroxenite. A possible origin for the garnet peridotite and chemically similar granulite facies ultramafic rocks is suggested. The eclogite facies in South Harris is reinstated in the light of the data presented.

Effects of Natural Gas Compositions on Engine In-Cylinder Process

2015 ◽  
Vol 1092-1093 ◽  
pp. 498-503
Author(s):  
La Xiang ◽  
Yu Ding
Keyword(s):  
Natural Gas ◽  
Alternative Fuels ◽  
Combustion Process ◽  
Engine Performance ◽  
Maximum Temperature ◽  
Maximum Pressure ◽  
Test Bed ◽  
Promising Alternative ◽  
Natural Gas Engines ◽  
Lower Maximum

Natural gas (NG) is one of the most promising alternative fuels of diesel and petrol because of its economics and environmental protection. Generally the NG engine share the similar structure profile with diesel or petrol engine but the combustion characteristics of NG is varied from the fuels, so the investigation of NG engine combustion process receive more attentions from the researchers. In this paper, a zero-dimensional model on the basis of Vibe function is built in the MATLAB/SIMULINK environment. The model provides the prediction of combustion process in natural gas engines, which has been verified by the experimental data in the NG test bed. Furthermore, the influence of NG composition on engine performance is investigated, in which the in-cylinder maximum pressure and temperature and mean indicated pressure are compared using different type NG. It is shown in the results that NG with higher composition of methane results in lower maximum temperature and mean indicated pressure as well as higher maximum pressure.

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