海南石碌地区早三叠世闪长玢岩脉U-Pb年代学及构造意义

李艳军; 魏俊浩; 伍刚; 谭俊; 石文杰; 赵少卿; 王永辉

doi:10.3799/dqkx.2013.025

Volume 38 Issue 2

Mar. 2013

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Article Navigation > Earth Science > 2013 > 38(2): 241-252

LI Yan-jun, WEI Jun-hao, WU Gang, TAN Jun, SHI Wen-jie, ZHAO Shao-qing, WANG Yong-hui, 2013. Early Triassic Diorite-Porphyrite Dikes from the Shilu Area, Hainan Island: Zircon U-Pb Age and Tectonic Implication. Earth Science, 38(2): 241-252. doi: 10.3799/dqkx.2013.025

Citation:

LI Yan-jun, WEI Jun-hao, WU Gang, TAN Jun, SHI Wen-jie, ZHAO Shao-qing, WANG Yong-hui, 2013. Early Triassic Diorite-Porphyrite Dikes from the Shilu Area, Hainan Island: Zircon U-Pb Age and Tectonic Implication. Earth Science, 38(2): 241-252. doi: 10.3799/dqkx.2013.025

Citation:

LI Yan-jun, WEI Jun-hao, WU Gang, TAN Jun, SHI Wen-jie, ZHAO Shao-qing, WANG Yong-hui, 2013. Early Triassic Diorite-Porphyrite Dikes from the Shilu Area, Hainan Island: Zircon U-Pb Age and Tectonic Implication. Earth Science, 38(2): 241-252. doi: 10.3799/dqkx.2013.025

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Early Triassic Diorite-Porphyrite Dikes from the Shilu Area, Hainan Island: Zircon U-Pb Age and Tectonic Implication

doi: 10.3799/dqkx.2013.025

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Hainan Mining Co.Ltd., Changjiang 572700, China

Received Date: 2012-03-18
Publish Date: 2013-03-01

Abstract

Abstract

The Shilu iron deposit is located in western section of the Wuzhishan Fold Belt, Hainan island.In this region, numerous intermediate-basic dikes dominated by diorite-porphyrite occurred. The dating of zircon from diorite-porphyrite dikes determined by LA-ICP-MS yields age of 248±1 Ma (MSWD=0.4), maybe bimodal intrusion with contemporary alkali-rich granites. Diorite-porphyrite dikes are dominated by shoshonitic rocks, which have SiO₂ varying from 49.18% to 55.25%, Al₂O₃ from 14.36% to 16.75%, FeO_t from 5.98% to 10.07% and MgO ranging from 3.80% to 5.43%. These dikes are enriched in large ion lithophile elements (LILE) and low rare earth elements (LREE) but depleted in high field strength element (HFSE).The Nb/Ta values of diorite-porphyrite vary from 15.33 to 17.80, Zr/Hf and La/Nb from 36.00 to 45.23 and 2.59 to 8.62, respectively.Two samples have (²⁰⁶Pb/²⁰⁴Pb)_t=18.087-18.483, (²⁰⁷Pb/²⁰⁴Pb)_t=15.473-15.589 and (²⁰⁸Pb/²⁰⁴Pb)_t=38.272-38.817, similar to the data of contemporary alkali-rich granites. Geochemical and Pb isotopic compositions indicate that these dikes are possibly derived from enriched mantle and slightly contaminated with crust.Hf/3-Th-Ta and Zr-Zr/Y discriminant diagrams imply these diorite-porphyrite dikes intruded in a local nextensional tectonic setting in continental arc, caused by the Indian plate northeastern subduction to the South China Block.
- diorite-porphyrite dike,
- Early Triassic,
- continental margin arc,
- Shilu iron deposit,
- geochronology,
- Hainan island

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References(61)

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