Ciletuh Subduction, West Java - New Findings, New Problems: Regional Implications to Cretaceous-Paleogene Convergence of Sundaland Margin and Its Petroleum Geology

2021 ◽  
Author(s):  
A. H. Satyana
Keyword(s):  
Subduction Zone ◽  
Subduction Zones ◽  
Field Studies ◽  
Point Of View ◽  
Island Arc ◽  
West Java ◽  
Central Java ◽  
Basement Rocks ◽  
New Findings ◽  
Cretaceous Subduction

Ciletuh, southwest Java has been well known as one of the places in Java where pre-Tertiary basement rocks are exposed (Verbeek and Fennema, 1896; Duyfjes, 1940; van Bemmelen, 1949; Sukamto, 1975). In plate tectonic point of view, Ciletuh has been known as place outcropping melange complex related to pre-Tertiary oceanic plate subduction (Thayyib et al., 1977). Ciletuh subduction regionally has been linked to the Cretaceous subduction zones of Luk Ulo/Karang Sambung (Central Java) and Meratus Mountains (South Kalimantan) (Hutchison, 1973; Asikin 1974; Hamilton, 1979). Ciletuh subduction however, has not been dated using metamorphic rocks formed in its subduction zone. Its link to Luk Ulo and Meratus subduction zone only based on the presence of melange, which also lacks of data Meanwhile, subduction zones of Luk Ulo and Meratus have been dated and analysed. We herewith present the results of new field studies and various analyses carried out in the last five years of the Ciletuh subduction complex. The indication of Cretaceous subduction has not found from the date measurement, Ciletuh shows Eocene related subduction. Most of the ophiolites were island-arc tholeiitic or island-arc basalt formed in supra-subduction zone. The overlying olistostrome deposits were younger than previously considered and lasted until early/middle Miocene. Some of the basaltic pillowed lava is considered as part of the ophiolite, while the ones at Gunung Badak is more likely a part of the early Miocene Jampang volcanism. Link of Ciletuh to Early Cretaceous subduction of Luk Ulo is not supported by geochronological data. The new knowledge of Ciletuh subduction implies the pre-Tertiary and Paleogene geology of Java, and petroleum prospectivities of the Paleogene objectives of southern West Java. New problems arise and need more field data and analyses to find out the answers.

Geology, petrology and tectonomagmatic evolution of the plutonic crustal rocks of the Sabzevar ophiolite, NE Iran

2013 ◽  
Vol 150 (5) ◽  
pp. 862-884 ◽  
Author(s):  
MORTEZA KHALATBARI JAFARI ◽  
HASSAN A. BABAIE ◽  
MOJTABA MIRZAIE
Keyword(s):  
Subduction Zone ◽  
Subduction Zones ◽  
Island Arc ◽  
Magma Chambers ◽  
Northern Margin ◽  
Crustal Rocks ◽  
Microscopic Studies ◽  
Element Enrichment ◽  
Spider Diagrams ◽  
Ocean Ridge

AbstractThe plutonic crustal sequence exposed northeast of Sabzevar is part of the ophiolitic belt of Sabzevar that occurs along the northern margin of the Central Iran micro-continent. The sequence includes olivine and pyroxene gabbro with cumulate characteristics, isotropic gabbro, foliated gabbro and a diabase sheeted dyke complex cut by wehrlite and olivine websterite intrusions, and pegmatite gabbro and plagiogranite as small intrusions and dykes. The sequence is comparable to gabbros in known ophiolite complexes. Microscopic studies show an abundance of the mesocumulate and heteradcumulate textures that represent open system magma chambers, which are common in supra-subduction zones. The olivine → plagioclase → clinopyroxene → ± orthopyroxene → amphibole trend of mineralization in the gabbros, similar to mid-ocean ridge basalt (MORB), and olivine → clinopyroxene → ± orthopyroxene → plagioclase → amphibole, similar to arc rocks, indicate the diversity in the formation of these rocks, and represent petrographic evidence of their formation in a supra-subduction zone. The rocks have calc-alkaline to tholeiitic affinities, and niobium depletion in the spider diagrams of diabase that matches the patterns of island arc magma. These patterns, and the light rare earth element enrichment of the diabase and plagiogranite, suggest the effect and introduction of the fluids, originating from the subducting slab, beneath the mantle wedge. The low titanium compositions, matching those of arc diabase and plagiogranite, plot in the island arc to MORB tectonomagmatic fields, and suggest formation of the Sabzevar ophiolitic plutonic crustal sequence in a supra-subduction zone during Late Cretaceous time.

Sedimentation and volcanism in the Panamanian Cretaceous intra-oceanic arc and fore-arc: New insights from the Azuero peninsula (SW Panama)

2013 ◽  
Vol 184 (1-2) ◽  
pp. 35-45 ◽  
Author(s):  
Isaac Corral ◽  
David Gómez-Gras ◽  
Albert Griera ◽  
Mercè Corbella ◽  
Esteve Cardellach
Keyword(s):  
Subduction Zone ◽  
Subduction Zones ◽  
Water Environment ◽  
Sediment Supply ◽  
Lava Flows ◽  
Turbidity Currents ◽  
Volcanic Arc ◽  
Basement Rocks ◽  
Volcanic Source ◽  
Azuero Peninsula

Abstract The Azuero Peninsula, located in SW Panama, is a region characterized by a long-lived intra-oceanic subduction zone. Volcanism began in Late Cretaceous time, as the result of subduction of the Farallon plate beneath the Caribbean plate. Usually, ancient volcanic arcs related to intra-oceanic subduction zones are not preserved, because they are in areas with difficult access or covered by modern volcanic arc material. However, on the Azuero peninsula, a complete section of the volcanic arc together with arc basement rocks provides the opportunity to study the sedimentation and volcanism in the initial stages of volcanic arc development. The lithostratigraphic unit which records fore-arc evolution is the “Río Quema” Formation (RQF), a volcanic apron composed of volcanic and volcaniclastic sedimentary rocks interbedded with hemipelagic limestones, submarine dacite lava domes, and intruded by basaltic-andesitic dikes. The “Río Quema” Formation, interpreted as a fore-arc basin infilling sequence, lies discordantly on top of arc basement rocks. The exceptionally well exposed arc basement, fore-arc basin, volcanic arc rocks and arc-related intrusive rocks provide an unusual opportunity to study the relationship between volcanism, sedimentation and magmatism during the arc development, with the objective to reconstruct its evolution. The “Río Quema” Formation can be divided into three groups: 1) proximal apron, a sequence dominated by lava flows, interbedded with breccias, mass flows and channel fill, all intruded by basaltic dikes. The rocks represent the nearest materials to the volcanic source, reflecting a coarse sediment supply. This depositional environment is similar to gravel-rich fan deltas and submarine ramps; 2) medial apron, characterized by a volcanosedimentary succession dominated by andesitic lava flows, polymictic volcanic conglomerates and crystal-rich sandstones with minor pelagic sediments and turbidites. These rocks were deposited from high-density turbidity currents and debris flows, directly derived from erupted material and gravitational collapse of an unstable volcanic edifice or volcaniclastic apron; 3) distal apron, a thick succession of sandy to muddy volcaniclastic rocks, interbedded with pelagic limestones and minor andesitic lavas, intruded by dacite domes and by basaltic to andesitic dikes. Bedforms and fossils suggest a quiet, relatively deep-water environment characterized by settling of clay and silt (claystone, siltstone) and by dilute turbidity currents of reworked volcaniclastic detritus. The timing of the initial stages of the volcanic arc has been constrained through a biostratigraphic study, using planktonic foraminifera and radiolarian species. The fossil assemblage indicates that the age of the “Río Quema” Formation ranges from Late Campanian to Maastrichtian, providing a good constraint for the development of the volcanic arc and volcaniclastic apron, during the initial stages of an intra-oceanic subduction zone.

scholarly journals Igneous Rock Associations 13. Focusing on the Central American Subduction Zone

2014 ◽  
Vol 41 (1) ◽  
pp. 57 ◽  
Author(s):  
James A. Walker ◽  
Esteban Gazel
Keyword(s):  
Costa Rica ◽  
El Salvador ◽  
Subduction Zone ◽  
Subduction Zones ◽  
Central American ◽  
Volcanic Front ◽  
New Findings ◽  
Galapagos Plume ◽  
Subduction Input ◽  
Central American Subduction Zone

Central America has recently been an important focus area for investigations into the complex processes occurring in subduction zones.  Here we review some of the new findings concerning subduction input, magma production and evolution, and resultant volcanic output.  In the Nicaraguan portion of the subduction zone, subduction input is unusually wet, likely caused by extensive serpentinization of the mantle portion of the incoming plate associated with bending-related faulting seaward of the Middle America trench. The atypical influx of water into the Nicaraguan section of the subduction zone ultimately leads to a regional maximum in the degree of mantle melting.  In central Costa Rica, subduction input is also unusual in that it includes oceanic crust flavored by the Galapagos plume.  Both of these exotic subduction inputs are recognizable in the compositions of magmas erupted along the volcanic front.  In addition, Nicaraguan magmas bear a strong chemical imprint from subducting hemipelagic sediments.  The high-field-strength-element depletions of magmas from El Salvador through Costa Rica are related to local variations in the depth to the subducting Cocos plate, and, therefore, to segmentation of the volcanic front.  Minor phases, probably amphibole or rutile, control these variable depletions. Silicic magmas erupted along the volcanic front exhibit the same along-arc geochemical variations as their mafic brethren.  This and their mantle-like radiogenic isotopic compositions suggest the production of juvenile continental crust all along the Central American subduction zone.  Punctuated times of enhanced magmatic input from the mantle may aid in crustal development.SOMMAIREL’Amérique centrale a récemment été le lieu de recherches sur les processus complexes se produisant dans les zones de subduction.  Ici nous passons en revue certaines découvertes sur nature des intrants de subduction, la production et l’évolution des magmas, ainsi que les extrants volcaniques résultants.  Dans le segment nicaraguayen de la zone de subduction, les intrants de subduction sont exceptionnellement humides, probablement à cause de la serpentinisation généralisée de la portion mantélique de la plaque en subduction, fissurée par flexure dans partie marine de la fosse océanique de l’Amérique centrale.  L'afflux atypique en eau dans le segment nicaraguayen de la zone de subduction induit ultimement un maximum régional de la proportion de fusion du manteau.  Dans la portion centrale du Costa Rica l’intrant de subduction est lui aussi atypique en ce qu’il comprend une croûte océanique teintée par le panache des Galápagos.  Ces deux intrants de subduction atypiques sont répercutés dans la composition des magmas éjectés le long du front volcanique.  En outre, les magmas nicaraguayens affichent une forte empreinte chimique héritée des sédiments hémipélagiques en subduction.  Les appauvrissements en éléments à fortes liaisons atomiques des magmas, du El Salvador jusqu’au Costa Rica, sont liés à des variations localisées de la profondeur de la plaque en subduction de Cocos, et donc, à la segmentation du front volcanique.  Des phases mineures, probablement amphibole et rutile, déterminent ces appauvrissements variables.  Les magmas siliceux éjectés le long du même front volcanique montrent les mêmes variations géochimiques le long de l’arc que leur contrepartie mafique.  De plus, les compositions radiogéniques de leurs contreparties mantéliques évoquent la production d’une croûte continentale juvénile le long de la zone de subduction de l’Amérique centrale.  Des épisodes d’accroissements ponctuels des intrants magmatiques du manteau peuvent contribuer au développement d’une croûte.

scholarly journals A Note on The Genus Evolvulus (Convolvulaceae) In Java, Indonesia

2020 ◽  
Vol 5 (1) ◽  
pp. 90-98
Author(s):  
Arifin Surya Dwipa Irsyam ◽  
Muhammad Rifqi Hariri ◽  
Rina Ratnasih Irwanto ◽  
Wendy Achmad Mustaqim
Keyword(s):  
Field Studies ◽  
Field Observations ◽  
Botanic Gardens ◽  
West Java ◽  
Taxonomic Information ◽  
Central Java ◽  
Evolvulus Alsinoides ◽  
On This Island

According to the Flora of Java, there is only one species of Evolvulus in Java, namely Evolvulus alsinoides. Since then, a second species was reported in 2017 from Universitas Indonesia, Depok, West Java, as an alien naturalized species. Some recent field studies have been conducted to provide updated taxonomic information of the genus on this island. The field observations were carried out in Banten, Jakarta, West Java, Jogjakarta, and East Java from March to December 2019. The herbarium studies were also conducted in Herbarium Bogoriense, Herbarium of Bogor Botanic Gardens, Herbarium Bandungense, and Herbarium of the Department of Biology, Universitas Indonesia. Our study reveals one newly recorded species of Evolvulus in Java already grown in cultivation, namely E. glomeratus Nees & Mart. subsp. grandiflorus (Parodi) Ooststr. Besides that, Evolvulus nummularius is now also reported to occur in other sites of West Java and extended to Central Java. An updated key to Evolvulus in Java, descriptions to both species, photographs, and brief discussions are provided.

Pemakaian Pribahasa dan Kata Mutiara dalam Retorika Dakwah Para Da’i di Indonesia : Kajian Stalistika dalam Sastra Arab-Indonesia

2018 ◽  
Vol 24 (2) ◽  
pp. 325-345
Author(s):  
Yani'ah Wardhani
Keyword(s):  
Research Method ◽  
Word Meaning ◽  
West Java ◽  
Linguistic Style ◽  
Central Java ◽  
Collective Data ◽  
The Subject ◽  
Unique Style ◽  
Bahasa Indonesia ◽  
Educational Information

Da’wa that done by Da’i in Indonesia can not be detached from the efectivity of rethorical use. By shape the form of narration, choosing the nuances of the exact word meaning, also choosing the linguistic and interested word, will help da’i to get the interesting programmatic, so that can made and influence audiences to listen. The research method of this writing is descriptive qualitative analyziz. The data that used is a form of rethoric in the programmatic of oral da’wa of all da’i in Jakarta, West Java, and central Java. The research sources are the programmatic of oral da’wa that located in the published book and also recording. The collective data method are; reading, and repeatedly listening into the da’wa subject of da’i. Analyziz data technic are; understanding and interpretation. The result of this research is that in generally, the da’i used the literature linguistic style in delivering the subject of da’wa in shaping the proverb (amsal) and hikmah, whether came from Arabic or Indonesia. The linguistic that used by da’i, came from Al-Qur’an, Al-Hadist, wise word and from qaol Ulama dan Hukama.  The style of rethorical that used by KH.Zaenuddin MZ is to change belief, and in this term the da’i can change the attitude of audience. In a rethorical that used by Aa Gym is to inform, because many educational information that been accepted by aim to explain the things that has not known before. Meanwhile, the rethorical of UJE (Jefry alBukhory) has the unique style from other, because supported by his good voice while chanting the verse of Al-qur’an. Also, the rethorical style that used by Ahmad al Habsyi and Wijayanto that has similarity from the subject point, that used the beautiful style of locution by amtsal and hikmah---Dakwah yang dilakukan oleh para da’i di Indonesia tidak dapat terlepas dari efektifitas pemanfaatan retorika. Dengan menata bentuk-bentuk tuturan, memilih nuansa makna kata yang tepat serta memilih gaya bahasa dan kata mutiara  yang menarik akan lebih sempurna  bagi penutur untuk mendapatkan wacana yang menarik sehingga mampu mempengaruhi pendengar.  Metode penelitian yang digunakan adalah deskriptif kualitatif analisis. Data yang digunakan berupa bentuk retorika dalam wacana dakwah lisan para da’i di  DKI, Jawa Barat, dan Jawa tengah. Sumber data penelitian  berupa wacana dakwah lisan yang terdapat dalam buku-buku yang telah diterbitkan dan rekaman. Teknik pengumpulan data, meliputi: membaca dan mendengarkan secara berulang-ulang materi  dakwah para da’i. Teknik analisis data, meliputi: pemahaman,dan  interpretasi. Hasil temuan, bahwa secara umum para dai menggunakan gaya bahasa sastra  dalam menyampaikan materi dakwahnya dalam bentuk peribahasa (amsal) dan kata mutiara (hikmah) baik berasal dari bahasa Arab maupun bahasa Indonesia. Gaya bahasa yang digunakan oleh para dai mayoritas bersumber dari Al Qur’an, Al-Hadist, kata-kata bijak dari qaol Ulama dan Hukama.  Bentuk retorika yang sering digunakan oleh KH. Zaenuddin MZ adalah to change belief, dan dalam hal ini penceramah mampu mengubah sikap.  Sedangkan bentuk retorika yang digunakan oleh Aa Gym adalah to inform (pendidikan) karena banyak informasi pendidikan  yang diterima dengan bertujuan untuk menjelaskan hal- hal yang belum diketahui sebelumnya.  Retorika UJE memiliki gaya khas dari yang lainnya, karena didukung  suaranya yang merdu menjadi pengikat hati ketika melantunkan cinta Allah dan Rasulnya. Demikian juga bentuk retorika yang digunakan oleh Ahmad  al Habsyi dan ustadz Wijayanto ada kesamaan dari sisi materi, yaitu menggunakan style gaya bahasanya yang indah dengan amtsal dan Hikmah

IMPLEMENTATION OF SUSTAINABLE AQUACULTURE AS A MODEL OF SATO UMI TO IMPROVE PRODUCTIVITY WITHIN COASTAL AREA OF INDONESIA

2017 ◽  
Author(s):  
Suhendar I Sachoemar ◽  
Suhendar I Sachoemar ◽  
Tetsuo Yanagi ◽  
Tetsuo Yanagi ◽  
Mitsutaku Makino ◽  
...  
Keyword(s):  
Coastal Area ◽  
Sustainable Aquaculture ◽  
The South ◽  
West Java ◽  
The Public ◽  
Central Java ◽  
South Sulawesi ◽  
Similar Program ◽  
Technology Dissemination

The development of sustainable model of aquaculture by applying Sato Umi concept within coastal area of Indonesia has expanded from the center of first experiment in the northern coastal area of west Java to central Java (western Indonesia) and Bantaeng in the South Sulawesi of central Indonesia. The similar program has also been proposed for Maluku Province in the eastern part of Indonesia. In the next 5 years, Indonesia is developing the Techno Parks Program in some areas, in which aquaculture and fisheries activities development on the base of Sato Umi concept in the coastal area are involves in this program. The development of Techno Parks are directed as a center application of technology to stimulate the economy in the regency, and a place of training, apprenticeship, technology dissemination center, and center business advocacy for the public. Hopely, Sato Umi concept that has a similar spirit with Techno Park can be applied to support the implementation of Techno Park program in Indonesia

scholarly journals Sixty Years with the Chrysobalanaceae

2020 ◽  
Author(s):  
Ghillean T. Prance
Keyword(s):  
Economic Botany ◽  
Field Studies ◽  
Molecular Evidence ◽  
New Techniques ◽  
Conservation Ecology ◽  
The Past ◽  
New Findings ◽  
The Family ◽  
Molecular Studies ◽  
Economic Use

AbstractA review is given of the studies of Ghillean Prance and associates on the Chrysobalanaceae over the past sixty years. This has focussed on defining the generic boundaries in the family and on monographic work with a worldwide approach to this pantropical family. The importance of field studies for work on monographs and Floras is emphasized. Monographs are still the basis for much work on conservation, ecology and economic botany and are needed as a foundation for molecular studies. The importance of being open to experimenting with new techniques and as a result being willing to change the taxonomy in accordance with new findings is demonstrated and emphasized. The twelve genera of the Chrysobalanaceae at the beginning of this career-long study have now increased to twenty-eight in order to present a much better monophyletic and evolutionary arrangement based on recent molecular evidence. In particular it was necessary to divide and rearrange the originally large genera Parinari and Licania into a number of smaller segregate genera. All known species were included in a worldwide monograph published in 2003. A brief review of the economic use for the family is given.

scholarly journals Up the down escalator: the exhumation of (ultra)-high pressure terranes during on-going subduction

2012 ◽  
Vol 4 (1) ◽  
pp. 745-781 ◽  
Author(s):  
C. J. Warren
Keyword(s):  
High Pressure ◽  
Subduction Zone ◽  
Continental Crust ◽  
Subduction Zones ◽  
Crustal Material ◽  
Time And Space ◽  
Ultra High Pressure ◽  
Tectonic Environment ◽  
Tectonic Style ◽  
Weak Material

Abstract. The exhumation of high and ultra-high pressure rocks is ubiquitous in Phanerozoic orogens created during continental collisions, and is common in many ocean-ocean and ocean-continent subduction zone environments. Three different tectonic environments have previously been reported, which exhume deeply buried material by different mechanisms and at different rates. However it is becoming increasingly clear that no single mechanism dominates in any particular tectonic environment, and the mechanism may change in time and space within the same subduction zone. In order for buoyant continental crust to subduct, it must remain attached to a stronger and denser substrate, but in order to exhume, it must detach (and therefore at least locally weaken) and be initially buoyant. Denser oceanic crust subducts more readily than more buoyant continental crust but exhumation must be assisted by entrainment within more buoyant and weak material such as serpentinite or driven by the exhumation of structurally lower continental crustal material. Weakening mechanisms responsible for the detachment of crust at depth include strain, hydration, melting, grain size reduction and the development of foliation. These may act locally or may act on the bulk of the subducted material. Metamorphic reactions, metastability and the composition of the subducted crust all affect buoyancy and overall strength. Subduction zones change in style both in time and space, and exhumation mechanisms change to reflect the tectonic style and overall force regime within the subduction zone. Exhumation events may be transient and occur only once in a particular subduction zone or orogen, or may be more continuous or occur multiple times.

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