Tertiary magmatic belts in Java

Soeria-Atmadja, Rubini; Maury, René C.; Bellón, Hervé; Pringgoprawiro, H.; Polvé, Mireille; Priadi, Bambang

doi:10.1016/0743-9547(94)90062-0

Cited by 120 publications

(98 citation statements)

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“…Primary data came from central to eastern Java, where we conducted field visits and direct observations. Geochronology data were compiled from many published papers and unpublished agency reports, such as JICA-JOGMEC (2004), Soeria-Atmadja et al (1994), Marcoux and Milesi (1994), Saefudin (1994), Sunardi and Kimura (1998), Lemigas (2001), Harijoko et al (2004), andMcInnes et al (2004). The majority of geochronology techniques used the whole-rock K-Ar dating method.…”

Section: Datasetsmentioning

confidence: 99%

Cenozoic Island Arc Magmatism in Java Island (Sunda Arc, Indonesia): Clues on Relationships between Geodynamics of Volcanic Centers and Ore Mineralization

Setijadji¹,

Kajino²,

Imai³

et al. 2006

Resource Geology

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. Java island, regarded as a classic example of island arcs, is built through multi events of Cenozoic arc magmatism produced by the subduction of Indian‐Australian oceanic crusts along the southern margin of Eurasian plate. Regional crustal compositions, subducted slabs, and tectonics determined the spatial‐geochemical evolution of arc magmatism and regional metallogeny. Tertiary geodynamics of island arc was dominated by backarc‐ward migrations of volcanic centers. Only after the Miocene‐Pliocene roll‐back effects of retreating slab, slab detachment, and backarc magmatism took place in central Java. The source of arc magmas is mainly partial melting of mantle wedge, triggered by fluids released from dehydrated slabs. Increasing potassium contents of arc magmas towards the backarc‐side and younger magmas is typical for all magmas, while alkali and incompatible trace elements ratios are characteristics for different settings of volcanic centers. The oceanic nature of crust and the likely presence of hot slab subducted beneath the eastern Java determine the occurrences of adakitic magmas. Backarc magmatism has a deeper mantle source with or without contributions from subduction‐related materials. The domination of magnetite‐series magmatism determines the sulfide mineralization for the whole island. District geology, geodynamics, and magma compositions in turn control particular styles and scales of precious metals concentrations. Deep‐seated crustal faults have focused the locations of overlapping volcanic centers and metalliferous fluids into few major gold districts. Porphyry deposits are mostly concentrated within Lower Tertiary (early stage) volcanic centers in eastern Java which are not covered by younger volcanic centers, and whose sulfides are derived from partial melting of basaltic parental materials. On the other hand, high‐grade low‐sulfidation epithermal gold deposits formed in later stages of arc development and are spatially located within younger volcanic centers (Upper Miocene‐Pliocene) that overlap the older ones. Gold in low‐sulfidation epithermal system is likely to be derived from crustal materials. The overall interacting factors resulting in the petrochemical systematics that are applicable for exploration: 1) early‐stage volcanic centers with high Sr/Y and Na2O/K2O ratios are more prospective for porphyry mineralization, while 2) later‐stage volcanic centers with high K2O, total alkali, and K2O/Na2O ratios are more prospective for low‐sulfidation epithermal mineralization.

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Section: Datasetsmentioning

confidence: 99%

Cenozoic Island Arc Magmatism in Java Island (Sunda Arc, Indonesia): Clues on Relationships between Geodynamics of Volcanic Centers and Ore Mineralization

Setijadji¹,

Kajino²,

Imai³

et al. 2006

Resource Geology

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“…The compositional affinity of the volcanics on Java has shifted from island arc tholeiite and minor shoshonite (Tertiary volcanic arc) to calc-alkaline and minor tholeiite (Quaternary Sunda Arc; Soeria-Atmadja et al, 1994). Quaternary volcanoes located behind the volcanic front are mostly alkalic potassic to ultrapotassic in composition (Soeria-Atmadja et al, 1994). The trend in increasing alkalinity is inferred to have been the result of the diminishing influence of the slab (Edwards et al, 1994) combined with differences in mantle sources or partial melting (Hoogewerff, 1999;.…”

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confidence: 99%

Fumarolic Activity, Acid-Sulfate Alteration, and High Sulfidation Epithermal Precious Metal Mineralization in the Crater of Kawah Ijen Volcano, Java, Indonesia

Scher

Williams‐Jones

2013

Economic Geology

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High-sulfidation epithermal deposits are genetically associated with calc-alkaline volcanism in subduction zones, and although these ore deposits are excellent places to focus research, subduction zone stratovolcanoes provide important windows on magmatic-hydrothermal processes that are not available from study of the corresponding ore deposits. There is general agreement that the hydrothermal alteration accompanying the high-sulfidation epithermal ores is the product of volcanic degassing, however, there is considerably less agreement on the nature and origin of the ore fluid. Opinion is divided over whether the ore fluid is a vapor or a liquid, and whether it is entirely volcanic or of mixed volcanic-meteoric origin.The research presented here details a field-based investigation of the magmatic-hydrothermal environment of Kawah Ijen volcano, an active stratovolcano (mainly andesitic pyroclastics and lavas) located in the Ijen Caldera Complex in Java, Indonesia. The Kawah Ijen crater is approximately one kilometer in diameter and contains a hyperacidic lake (pH ~ -0.5) and a small and actively degassing solfatara, which is surrounded by a much larger area of acidsulfate alteration that was exposed during a phreato-magmatic eruption of the volcano in 1817; the eruption excavated the crater to a depth of 250 m. The research described in this thesis involved sampling and chemical analyses of the gases and their condensates (the surface equivalents of the ore-forming magmatichydrothermal fluids) collected from the solfatara and rock samples taken from the alteration center.Condensed fumarolic gases (pH ~ -0.5) released from the solfatara and sampled at temperatures between 330 and 495 °C contain up to 3 ppm Cu and 3.8 ppm As; the concentration of Ag is below detection. The alteration center is characterized by zones of residual silica, alunite-pyrite and kaolinite/dickite; based on alunite-pyrite geothermometry, the area formed at a temperature between 200 and 300 °C. High sulfidation epithermal mineralization occurs in this area in the form of massive and vein-hosted pyrite that contains up to 200 ppb iii Au, 16 ppm Ag, 6,800 ppm Cu, and 3,430 ppm As; these elements are invisible at the highest resolution of scanning electron microscopy, and thus occur either in the form of nano-particles or are in solid solution in the pyrite.The manuscript in Chapter 3 summarizes the observations detailed above to support a model in which highly acidic gases condensed ~ 250 m beneath the floor of the pre-1817 crater at Kawah Ijen volcano. In the area near the source of the vapors, the ratio of fluid to rock was extremely high and resulted in the leaching of elements from the andesitic host rock, leaving behind a residue of "vuggy silica." With increasing distance from the source, in an area of intermediate fluid/rock ratio, the condensed liquids replaced the primary minerals of the host with alunite and pyrite. The kaolinite/dickite zone formed in a rockbuffered environment (low fluid/rock ratio), in the zone furthest fr...

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“…Gunung Slamet termasuk deretan gunungapi Kuarter (Soeria-Atmadja et al, 1994), memiliki tipe strato volcano disusun oleh endapan piroklastik dan lava yang umumnya berkomposisi andesit, serta masih aktif dicirikan oleh kemunculan kegiatan solfatara dan sejumlah mata air panas pada elevasi sekitar 1.200 m (Hochstein et al, 2008). Gunung ini merupakan produk penunjaman Lempeng Indo-Australia dengan Lempeng Eurasia bagian tenggara (Hamilton, 1979).…”

Section: Pendahuluanunclassified

Struktur Geologi Dan Litologi Sebagai Kontrol Munculnya Mata Air Panas Di Guci Dan Baturaden, Jawa Tengah

et al. 2017

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ABSTRAK Mata air panas Kalipedes dan Guci di lereng baratlaut Gunung Slamet, Jawa Tengah muncul pada kontak antara batuan breksi gunungapi dengan aliran lava. Mataair panas tersebut terletak pada suatu kelurusan struktur atau sesar berarah barat-timur untuk mataair panas Kalipedes dan kelurusan berarah baratlauttenggara untuk mataair panas Guci. Mataair panas Baturaden yang terletak di kaki tenggara G. Slamet muncul pada kontak antara breksi polimik dengan lava pada suatu lembah sungai yang berarah relatif baratlaut-tenggara. Batuan breksi umumnya memiliki tingkat kelulusan fluida yang tinggi sedangkan aliran lava relatif kedap fluida. Batuan gunungapi di daerah penelitian disusun oleh basal olivin, andesit basaltik, andesit piroksin dengan kandungan kalium cukup tinggi atau berafinitas sebagai basal atau andesit kalk alkalin. Kehadiran struktur utama pengontrol pemunculan mataair panas dibuktikan dengan penelitian gas radon yang menunjukkan nilai radon yang cukup tinggi sampai tinggi >40 dpm/L dan kelulusan fluida yang tinggi yang ditafsirkan sebagai zona lemah akibat kegiatan struktur geologi di kawasan Kalipedes dan Guci, sedangkan di daerah Baturaden nilai gas radon relatif rendah sehingga diperkirakan kontrol utama pemunculan mataair panas adalah perbedaan kesarangan batuan. Kehadiran struktur geologi atau sesar-sesar tersebut dapat dibuktikan melalui penelitian magnetotelurik.

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Tertiary magmatic belts in Java

Cited by 120 publications

References 9 publications

Cenozoic Island Arc Magmatism in Java Island (Sunda Arc, Indonesia): Clues on Relationships between Geodynamics of Volcanic Centers and Ore Mineralization

Cenozoic Island Arc Magmatism in Java Island (Sunda Arc, Indonesia): Clues on Relationships between Geodynamics of Volcanic Centers and Ore Mineralization

Fumarolic Activity, Acid-Sulfate Alteration, and High Sulfidation Epithermal Precious Metal Mineralization in the Crater of Kawah Ijen Volcano, Java, Indonesia

Struktur Geologi Dan Litologi Sebagai Kontrol Munculnya Mata Air Panas Di Guci Dan Baturaden, Jawa Tengah

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