scholarly journals Study of Alteration Geochemistry and Mineralization in the Jawara Field, Jember Regency, East Java Province

2021 ◽  
Vol 2117 (1) ◽  
pp. 012003
Author(s):  
F R Widiatmoko ◽  
E Kusdarini ◽  
M A Irwanto ◽  
A Zamroni ◽  
H L Sunan ◽  
...  
Keyword(s):  
Precious Metal ◽  
Metallic Copper ◽  
Research Area ◽  
Mineral Deposits ◽  
Petrographic Analysis ◽  
Geochemical Analysis ◽  
Alteration Zones ◽  
Metal Elements ◽  
Argillic Alteration ◽  
Metallic Element

Abstract The Jawara Field in Jember Regency is a location where it is indicated that there are precious metal deposits in the form of porphyry type Gold and Copper. In this study, the focus is more on the search for metal mineral deposits related to the elements of Gold (Au) and Copper (Cu), namely the metal mineral chalcopyrite (CuFeS2) as the main carrier minerals for Au, Cu, Ag, as impurities. The results of alteration products in the form of weathered minerals are also the focus of research. The analysis used to detect metallic element content and the presence of metallic and non-metallic minerals is by petrographic analysis, mineragraphy analysis, sediment grain analysis and geochemical analysis. Based on the results of the mineragraphy analysis, it was proven that the metal mineral chalcopyrite was found in the JAFA 6 BPS sample which is a carrier mineral for the metallic copper element and silver was also found in JAFA 2 ALT. In addition, the results of the sediment grain analysis also found metal mineral grains and metal elements, namely copper and iron elements in all JAFA samples. The results of petrographic analysis show that the weathered minerals in the form of kaolinite, alunite, and smectite are products of hydrothermal alteration activities. Based on these results, the research area is divided into 3 alteration zones, namely potassic, propylitic, and argillic alteration zones. The results of the geochemical analysis showed that the highest levels of copper were found in JAFA 5 as much as 13.9 ppm and the highest levels of iron in JAFA 6 were 390.8 ppm. From the results of the analysis, it can be concluded that it is true that there are metal mineral deposits and metal elements in the form of sediment grains and porphyry-type Au and Cu elements.

scholarly journals Study of Hydrothermal Alteration and Mineralization in the Lahbako Field, Jember Regency, East Java Province

2021 ◽  
Vol 2117 (1) ◽  
pp. 012004
Author(s):  
F R Widiatmoko ◽  
A S Sari ◽  
J A N Ramadhanty ◽  
R H K Putri
Keyword(s):  
Hydrothermal Alteration ◽  
Research Area ◽  
Geological Structure ◽  
Mineral Deposits ◽  
Petrographic Analysis ◽  
Lineament Density ◽  
Argillic Alteration ◽  
Field Data Collection ◽  
Ore Minerals ◽  
High Sulfide

Abstract Administratively, the research location is in Lahbako Field, Jember Regency, East Java Province. This study discusses the geological characteristics, hydrothermal alteration, and mineralization in the study area. The method used is field data collection by mapping and laboratory analysis in the form of petrographic analysis and mineragraphic analysis. The research area is divided into three geomorphology units, namely a unit with steep hills, a unit with undulating hills, and a unit with sloping plains. The stratigraphy of the study area is divided into five-rock units, while the order of rock units from oldest to youngest is the volcanic Breccia unit, the intercalated Sandstone, and Claystone unit with Tuff insertion, the Diorite Intrusion Unit, the Granodiorite Intrusion Unit, and the youngest unit, namely Alluvium Unit. The research area has a high straightness density value and a straight lineage pattern that tends to be dense. The area with high lineament density is assumed to be the area with the best prospect of alteration and mineralization because the lineament reflects the geological structure which is the path of hydrothermal fluid passage that causes alteration and mineralization. Based on petrographic analysis, the research area has undergone alteration with the type of Philic alteration (Chlorite-Quartz-Feldspar), Prophiliic Alteration (Chlorite-Quartz-Feldspar) Feldspar-Quartz-Epidote) and Argillic Alteration (Alunite-Quartz-Biotite). The study area is indicated as an area with high sulfide epithermal mineral deposits where the indication is based on the discovery of vein textures in the form of Vuggy Quartz and ore minerals in the form of Silver, Copper, and Iron in mineragraphic analysis.

scholarly journals Characteristics of Ultramafic Igneous Rock Ofiolite Complex in Asera District, North Konawe Regency Southeast Sulawesi Province

2020 ◽  
Vol 5 (3) ◽  
pp. 121-126
Author(s):  
Hasria ◽  
Erzam S. Hasan ◽  
Deniyatno ◽  
L M Iradat Salihin ◽  
Asdiwan
Keyword(s):  
Major Element ◽  
Research Area ◽  
Ultramafic Rocks ◽  
Petrographic Analysis ◽  
Geochemical Analysis ◽  
Rock Formation ◽  
Rock Types ◽  
Original Rock ◽  
Rock Lithology

The research area is located in Asera District, North Konawe Regency, Southeast Sulawesi Province which has ultramafic rock lithology. The purpose of this study is to determine the characteristics of ultramafic igneous rocks using petrographic and geochemical analysis. Petrographic analysis aims to determine the types and abundance of minerals present so that rock types can be determined based on the classification of Travis (1955) and Streckeisen (1976). The geochemical analysis aims to determine the oxide/major element so that it can determine the type of magma based on the AFM classification according to Irvine and Baragar  (1971) and the origin of the magma / original rock formation environment based on Pearce (1977).  Petrographic analysis results showed that ultramafic rocks in the study area consisted of 2 types of rocks namely peridotite consisting of wherlit and lherzoite and serpentinite.  The results of geochemical analysis indicate that the type of magma in the study area is thoellitic series and the origin of the magma/rock formation environment comes from the expansion of the oceanic floor or mid oceanig ridge (MOR) which is ultramafic.

Progress in Platinum Group Element (PGE) in Black Shale Series

2013 ◽  
Vol 353-356 ◽  
pp. 1183-1186 ◽  
Author(s):  
Jun Liu ◽  
Ying Chen ◽  
Zhen Xiu Liao ◽  
Yong Zhan ◽  
You Fei Guan
Keyword(s):  
Mineral Resource ◽  
Fluid Inclusion ◽  
Black Shale ◽  
Precious Metal ◽  
Platinum Group Element ◽  
Platinum Group Elements ◽  
Group Element ◽  
Metal Elements ◽  
Platinum Group

The black shale enriched in various precious metal elements and platinum group elements. And the PGE deposit in black shale series is a new promising mineral resource. Comprehensive research on the geology, geochemistry, petrology, mineralogy, fluid inclusion and geochronology of the PGE in black shale series has been carried out and made a series of achievements. This paper summarized the advances in PGE in black shale series and pointed out the controversial views about the source of the PGE.

F, Cl content of Hydrothermal Biotite as a Geochemical Indicator Vectoring to Ore: Constrain on Niaz Cu-Mo porphyry Deposit, NW Iran

2020 ◽  
Author(s):  
Kamal Siahcheshm ◽  
Christiane Wagner ◽  
Beate Orberger ◽  
Michel Fialin ◽  
Nicolas Rividi
Keyword(s):  
Outer Part ◽  
Chemical Effect ◽  
Magmatic Fluid ◽  
Positive Correlation ◽  
Alteration Zones ◽  
Nw Iran ◽  
Metallogenic Belt ◽  
Argillic Alteration ◽  
Hydrothermal Replacement ◽  
Moderate Range

<p>The Niaz porphyry Cu-Mo deposit in the Arasbaran metallogenic belt of NW Iran exhibits extensive hydrothermal alteration developed in three temporally and spatially overlapping zones:   early potassic, transitional phyllic and intermediate argillic, and late advanced argillic. The early and transitional zones contain biotite, either of magmatic (re-equilibrated) or hydrothermal (replacement and/or neoformed) origin. This study aims to understand the petrography and chemistry of the hydrothermal biotite for evaluating the fluid compositional changes during alteration processes. Selected samples from the different alteration zones were studied for petrography crossing from inner to outer parts of the Niaz deposit. Electron microprobe analyses (Cameca SX100) including halogens (F and Cl) were performed on the hydrothermal micas at the Centre CAMPARIS, Institut des Sciences de la Terre de Paris (ISTeP), Sorbonne University, France. The biotite composition displays an increase in Al<sub>2</sub>O<sub>3</sub>, FeO and Cl, but a decrease in TiO<sub>2</sub>, MgO and F, from the potassic to the transitional phyllic and intermediate argillic alteration zones. The hydrothermal biotite with high Mg (X<sub>Mg</sub> = 0.61-0.72) inside potassic zone tends to incorporate more F and less Cl compared to the biotite with lower Mg; a crystal-chemical effect referred to as “Fe-F and Mg-Cl avoidance rules”. The biotite from the potassic zone possesses  a moderate range of F content (0.24 to 0.91wt. %) that is significantly higher than in the phyllic (0.45 to 0.62 wt. %) and argillic (0.19 to 0.37 wt. %) zones, exhibiting a positive correlation with X<sub>Mg</sub> and a negative correlation with Cl. However, the biotite from transitional phyllic as well as intermediate argillic alteration zones shows a scattered relationship.</p><p>The biotite from the central potassic to transitional phyllic and intermediate argillic alteration zones have average log (X<sub>F</sub>/X<sub>OH</sub>) values of ‑1.16, ‑1.19, and ‑1.44, respectively. The log (X<sub>Cl</sub>/X<sub>OH</sub>) values are ‑2.10, ‑1.97, and ‑1.98, whereas log (X<sub>Cl</sub>/X<sub>F</sub>) val­ues vary from 0.95, 0.78 to 0.54. The systematic variation of the logarithmic ratios reflects a sys­tematic variation of the F content in biotite associated with these alteration zones.</p><p>Microthermometric data of fluid inclusions show a decrease in temperature from potassic through phyllic to intermediate argillic zones (420, 360 and 280 °C, respectively). The log (fH<sub>2</sub>O/fHF) and log (fH<sub>2</sub>O/fHCl) values calculated for fluids equilibrated with biotite increase progressively outward in these alteration zones (6.04, 6.42 and 7.39, respectively). The decrease in halogen content of hydrothermal fluids toward outer parts of the deposits reflects an increase in the degree of mixing between magmatic fluid and meteoric water.</p><p>The F content of biotite decreases systematically toward the outer part of the deposit, while the Cl content shows unsystematic variations crossing the alteration zones. This finding suggests that the Cl content cannot be used as exploration tool for vectoring the mineralization. However, the positive correlation between the F content in biotite and bulk concentration of Cu in the different alteration zones may provide a possible geochemical tool to vectoring the Cu mineralization in porphyry deposits.</p>

Morphological Changes due to Anthropogenic Interferences in Gendol River Valley, Merapi Volcano

2020 ◽  
Vol 33 (2) ◽  
pp. 209-218
Author(s):  
Mukhamad Ngainul Malawani ◽  
Tiara Handayani ◽  
Jundi Muhammad Bariq ◽  
Radikal Lukafiardi
Keyword(s):  
Morphological Changes ◽  
Mining Area ◽  
Research Area ◽  
Petrographic Analysis ◽  
Mining Activities ◽  
River Sand ◽  
Merapi Volcano ◽  
Suitable Material ◽  
Aerial Mapping ◽  
Western Side

This research aims to identify the morphological changes in Gendol river, Merapi volcano. After the eruption 2010, Gendol river filled up by pyroclastic materials, then utilized as mining area. As the volcanic materials are abundance in Gendol river, sand mining activities are dominant, causing antrophogenic interferences that changes the morphology of Gendol valley. In this study, the morphological changes is measured by terrestrial survey, aerial mapping, and materials analysis through petrographic and granulometric analysis. Aerial mapping was conducted in February and August 2019 in order to identify the dynamic changes during 6 months observation. Vertical changes is found in the active mining zone, in western-side of research area, while horizontal changes was found in eastern-side. The comparison of widening and narrowing valley is 13:1 due to horizontal changes. Result of petrographic analysis showes that three different sampling locations originated from similar provenance, which is undissected arc provenance but may differ in period of sedimentation. Grain material found in research are categorized as suitable material for mining with the 0,733 mm grain size. However, the mining activities should be aware of material availability to minimize the riverbank failure.

Rembang Zone Petroleum Play, Stratigraphic and Petrographic Analysis of Ngrayong Formation as Reservoir, Jamprong Area, Tuban, East Java

2020 ◽  
Author(s):  
D., S. Reka
Keyword(s):  
Depositional Environment ◽  
Carbonate Platform ◽  
Research Area ◽  
Geological Mapping ◽  
Coarse Grained ◽  
Petrographic Analysis ◽  
North East ◽  
The North ◽  
Potential Reservoir ◽  
Sandstone Facies

The following research took place in the Jamprong area, Tuban Regency, East Java Province within a study area of 2 km2. Physiographically, the study area is situated in the anticlinorium of the Rembang Zone. This research aims to define the reservoir potential of outcrop samples from the Ngrayong Formation as an analogue for the subsurface. In addition, the depositional environment and the age of the rock in the research area was determined. The Ngrayong Formation is regarded as a potential reservoir in the North East Java Basin. The accumulated data consists of stratigraphy, petrographic analysisand paleontological analysis of rock samples, and geological mapping has been carried out to determine the distribution of rocks. Facies were determined based on outcrop observations and comprise predominantly arkose sandstone facies with fine – coarse grained, moderately sorted and with cross-bedding, herringbone, and lamination, and another facies namely massive carbonate grainstone. Based on these facies, the interpreted depositional environment is the transition of tidal flat to shallow marine carbonate platform with relative biostratigraphic age of Middle Miocene, Langhian to Serravallian (M6-M8 planktonic foraminiferal biozones). Rocks in the study area have porosity >20% or very good and permeability >130 or fair based on petrographic observations, and this supports the interpretation of the Ngrayong Formations as a potential reservoir of hydrocarbons.

An Experimental Investigation of the Use of Combined Resistivity and Temperature Logs for Scale Monitoring In Carbonate Formations During CO2 Sequestration

2014 ◽  
Vol 137 (3) ◽  
Author(s):  
Abdulrauf Rasheed Adebayo ◽  
Hasan Y. Al-Yousef ◽  
Mohammed Mahmoud
Keyword(s):  
Co2 Sequestration ◽  
Co2 Storage ◽  
The United States ◽  
Co2 Injection ◽  
Petrographic Analysis ◽  
Base Line ◽  
Geochemical Analysis ◽  
Overburden Pressure ◽  
Rock Interaction ◽  
Dissolution And Precipitation

This study investigates the prospect of using permanent downhole resistivity and temperature sensors for scale monitoring during CO2 sequestration in saline carbonate aquifer. Current industry practice involves continuous geochemical analysis of produced formation water and petrographic analysis of cuttings at the surface. A major limitation of such methods is that formation scale dynamics is not captured in situ and in real time. Moreover, high cost and compositional change of produced fluid caused by evolution of dissolved gases are other setbacks. In this study, resistivity and temperature measurements were logged continuously for several months at 30 min interval during CO2 storage in brine saturated core samples. Carbonate samples were acquired from Indiana outcrops in the United States and cut into cylindrical cores. Samples were saturated with synthetic formation brine and CO2 was injected and stored at a temperature of 45 °C, pore pressure of 2000 psig, and an overburden pressure of 2500 psig. The pressure, temperature and resistivity of samples were collected and transmitted to a PC computer at an interval of 30 min for the period of storage. A base line log recorded after CO2 injection but prior to CO2/brine/rock interaction (CBRI) allowed us to track onset of dissolution and precipitation. Deflection away from the baseline either inward or outward during the period of storage marks two distinct reaction phenomenon-dissolution and precipitation. Our hypothesis was justified by results of geochemical analysis of prestorage brine and poststorage brine, and also by petrographic study of the cores. Several other tests were also run to ensure consistency. This study is new compared to previous works in the following ways: Many previous works focused on the applicability of electrical resistivity measurements to track CO2 migration by way of resistivity change as a function of CO2 saturation changes during CO2 sequestration. Many others also studied the effect of CO2 injection on the petrophysical and electrical properties of rocks. Previous works of these types used continuous flow of fluid in and out of the sample and such flow experiments lasted only few hours. The fate of formation resistivity under static condition and at longer storage period was not considered.

Current Efficiency and Polarization Factors in the Electrolytic Process of Seawater Pretreatment

2014 ◽  
Vol 1065-1069 ◽  
pp. 3035-3040
Author(s):  
Jing Nie ◽  
Shou Zhi Yi
Keyword(s):  
Water Quality ◽  
Precious Metal ◽  
Main Ingredient ◽  
Metal Elements ◽  
The Core ◽  
Electrolytic Process ◽  
Core Technology ◽  
Initial Stage ◽  
Density Index ◽  
The Cost

The performance of the electrode is the core technology of the electrolytic process of seawater pretreatment, and has the decisive influence on the systematic technological process and water quality. In the initial stage of electrolytic technology being applied in seawater pretreatment, soluble anodes, which use the aluminum, ferrum or other metal elements as the main ingredient, are chosen for most cases. And this method can effectively reduce the turbidity of raw seawater and sludge density index (SDI). While applying a variety of methods, the proportion of electrolytic aluminum, ferrum and other metal elements in the water can be effectively controlled. And this can increase the ratio of hydrolysate, but will also introduce the composition of soluble electrode into the seawater inevitably. At the same time, the use of soluble electrode will be consumed continuously with the production process, which is likely to add the cost of production. This study uses electrodes which contain a variety of precious metal (such as Ti, Ru, and Ir) oxide in the seawater pretreatment process, which is different from traditional chlor-alkali industry.

Non-Precious Metal Carbamates as Catalysts for the Aziridine/CO2 Coupling Reaction Under Mild Conditions

2021 ◽  
Author(s):  
Guido Pampaloni ◽  
Giulio Bresciani ◽  
Fabio Marchetti ◽  
Stefano Zacchini
Keyword(s):  
Precious Metal ◽  
Coupling Reaction ◽  
Large Series ◽  
Metal Elements ◽  
Mild Conditions ◽  
Catalytic Potential ◽  
First Time

The catalytic potential of a large series of easily available metal carbamates (based on thirteen different non-precious metal elements) was explored for the first time in the coupling reaction between...

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