Geologic, geochemical, and fluid inclusion studies of the tin granites from the Bujang Melaka Pluton, Kinta Valley, Malaysia

Schwartz, Michael O.; Askury, A.K.

doi:10.2113/gsecongeo.84.4.751

Cited by 22 publications

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“…Assuming the same Sr initial ratio as for the unaltered biotite granite, this sample yields a consistent age of211 _+ 3 Ma. The actual Sr initial ratio of a muscovite-rich granite may be slightly higher than that of a biotite granite in the same pluton (Schwartz and Askury 1989) but such a difference does not greatly affect the age calculation for the two-mica granite at Pemali considering its very high 87Rb/S6Sr ratio 9 Other tinmineralized areas in Indonesia have similar ages based on K/Ar data: the greisen at Tikus and Batu Besi (Belitung) yield 195 _ 12 Ma and 200 + 12 Ma, respectively (Jones et al 1977); the greisen at Sungei Isahan (Sumatra) have an age in the range of 193-197 + 2 Ma (Schwartz and Surjono 1990b). Darbyshire (1988) obtained Rb/Sr isoehrons in the range of 200-252 Ma with initial ratios varying between 0.712 and 0.727 for six other granitoid plutons on Bangka Island 9…”

Section: Isotope Analysismentioning

confidence: 88%

“…The elevated concentrations of lithophile trace elements allow the correlation of the biotite granites in the Pemali area with the Western Granite Province (or Main Range) rather than with the Eastern Granite Province of Peninsular Malaysia (Liew 1983;Cobbing et al 1986;Schwartz and Askury 1989;Schwartz and Askury 1990).…”

Section: Biotite Granitementioning

confidence: 99%

“…Titanium liberated by the hydrothermal destruction of biotite is fixed in situ as newly formed rutile and sphene; apatite and zircon are stable mineral phases in the hydrothermally altered granite at Pemali. The hydrothermal immobility of TiO2, PzOs and Zr is a common feature of muscovitized granitoids (Schwartz 1982;Schwartz and Askury 1989;Schwartz and Surjono 1990c).…”

Section: Two-mica Granite and Muscovite Granitementioning

confidence: 99%

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The Pemali tin deposit, Bangka, Indonesia

Schwartz

Surjono²

1991

Mineral. Deposita

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Abstract. The Pemali tin deposit is located in a Triassic granite pluton the magmatic evolution of which is characterized by a decrease of compatible Ca, Mg, Ti, P and Zr in the sequence: medium-to coarse-grained biotite granite, megacrystic medium-grained biotite granite, two-mica granite/muscovite granite. The tin mineralization is confined to the two-mica granite and consists of disseminated cassiterite as well as greisen-bordered veins. The highly evolved muscovite granite is tin-barren and is distinguished from the two-mica granite by its low mica content and low loss-on-ignition values. The fluid inclusions in quartz and fluorite of the two-mica granite and of the greisen homogenize in the 115-410 ~ temperature range; the salinities are in the range of 0.4-23 equiv wt % NaC1 and the CO2 concentrations are < 2 mole %.

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Section: Isotope Analysismentioning

confidence: 88%

Section: Biotite Granitementioning

confidence: 99%

Section: Two-mica Granite and Muscovite Granitementioning

confidence: 99%

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The Pemali tin deposit, Bangka, Indonesia

Schwartz

Surjono²

1991

Mineral. Deposita

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“…gas-flow heating/freezing system. Primary fluid inclusions in cassiterite instead of quartz have been chosen, since it has been reported that the primary fluid inclusions in cassiterite and associated quartz which seems to have been formed at the same time have quite different compositions (Schwartz and Askury, 1989) and that coexisting wolframite, cassiterite and quartz have systematically different Th and salinities (Campbell and Panter, 1990); for granites, quartz is chosen as the host mineral of fluid inclusions for study. Only large (mainly >10|i.)…”

Section: Selection Of Fluid Inclusion Samplesmentioning

confidence: 99%

“…The study of fluid inclusions in quartz associated with ore minerals is based on the assumption that the quartz and the ore minerals were precipitated from the same ore-forming fluids at the same time. This assumption can be ascertained by careful petrographical studies, but examples have been reported that the primary fluid inclusions in cassiterite and associated quartz which seems to have been formed at the same time as the cassiterite have quite different composition (Schwartz and Askury, 1989) and that coexisting wolframite, cassiterite and quartz have systematically different Th and salinities (Campbell and Panter, 1990). In these cases, the primary fluid inclusions in the quartz do not well represent the ore-forming fluid.…”

Section: Host Mineralsmentioning

confidence: 99%

Controle polygenetique sur la localisation des gisements proximaux et distaux dans le champ polymetallique-stannifere a Xinlu Guangxi Chine meridionale

Chi¹

1992

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The Xinlu tin-poly metallic ore field in the Guangxi Autonomous Region of the Zhuang Nationality of southern China is associated with the Mesozoic Guposhan granitic batholith. The batholith consisting of at least three phases of intrusion intrudes Pre-Devonian meta-sedimentary rocks and Late Paleozoic sedimentary rocks including large amounts of carbonates. The ore field is situated at the southern margin of the batholith, where sedimentary rocks are surrounded by granites on three sides (west, north and east) and underlain by unexposed granites, exhibiting a concave intrusion surface. Dykes of intermediate to granitic compositions similar in age to the granites are widespread.Five tin-polymetallic deposits occur in the ore field; among them two (the Dachong and Liuhe'ao deposits) are located at the contact zone between the granitic intrusions and the Devonian sedimentary rocks and are considered as proximal deposits. The Baimianshan and Shimen deposits, classified as distal deposits, are located in the Devonian sedimentary rocks relatively far above the intrusions and are spatially related to dykes and/or fractures. The Muqiaomian deposit is situated in the sedimentary rocks not far from the contact zone, forming a transitional type between proximal and distal deposits.This study is an attempt to understand the mechanism of emplacement of proximal versus distal deposits, through factors such as ore-forming sources, migration and deposition processes.The proximal and distal deposits in the Xinlu ore field are mainly composed of sulfides, with pyrrhotite and sphalerite being the major components coexisting with cassiterite. A major difference between proximal and distal deposits is that the proximal deposits are associated with ore skarns superimposed on preore skarns, whereas the distal deposits are hosted by carbonates with relatively weak and restricted alterations. Both types have been considered to be related to late-stage intrusions of the Guposhan batholith. The localization of the ore deposits do not appear to be controlled by a specific sedimentary bed at the ore field scale. A correlation between the vertical distance from ore bodies to intrusion surface and the depth of emplacement of the intrusions can be established: proximal deposits are developed in the northern part of the ore field, where the granites were emplaced at higher levels; on the contrary distal deposits are developed in the southern part of the ore field where the granites were emplaced deeper. The transitional type of deposit (Muqiaomian), on the other hand, is developed in the western part of the ore field where the depth of emplacement of the intrusions is intermediate.The geochemical characteristics of the host rocks (granites, dykes and sedimentary rocks), including their major elements, trace elements, REE patterns, and Sr isotopes have been examined. It I I is indicated that the second and third phases of the Guposhan batholith belong to S-type granites, and fractional crystallization is most likely to be the process res...

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Textural variation and tin mineralization in granites from the main range province of the Southeast Asian Tin Belt

Pitfield¹,

Teoh²,

Cobbing³

1990

Geological Journal

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Textural evolution from coarse K-feldspar megacrystic granite, through heterogeneous granite porphyry to microgranite corresponds to a sequence of geochemical evolution. It was probably triggered by a sudden loss of pressure, resulting in quenching, fluidization, and disruptive emplacement of the residual melt into the partially or wholly crystalline host granite. It was accompanied by alkali metasomatism, volatile-fluxing, and hydrothermal alteration, culminating in the formation of greisen bordered vein swarms and massive greisens mineralized with tin and other metals.

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Geologic, geochemical, and fluid inclusion studies of the tin granites from the Bujang Melaka Pluton, Kinta Valley, Malaysia

Cited by 22 publications

References 0 publications

The Pemali tin deposit, Bangka, Indonesia

The Pemali tin deposit, Bangka, Indonesia

Controle polygenetique sur la localisation des gisements proximaux et distaux dans le champ polymetallique-stannifere a Xinlu Guangxi Chine meridionale

Textural variation and tin mineralization in granites from the main range province of the Southeast Asian Tin Belt

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