首页|Geochronology and Geochemistry of the Xingxingxia Triassic A-type Granites in Central Tianshan,NW China:Petrogenesis and Tectonic Implications
Geochronology and Geochemistry of the Xingxingxia Triassic A-type Granites in Central Tianshan,NW China:Petrogenesis and Tectonic Implications
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国家科技期刊平台
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The Triassic granitoids in Central Tianshan play a key role in determining the petrogenesis and tectonic evolution on the southern margin of the Central Asian orogenic belt.In this study,we present SHRIMP zircon U-Pb ages,Hf isotopic and geochemical data on the Xingxingxia biotite granite,amazonite granite and granitic pegmatite in Central Tianshan,NW China.Zircon U-Pb dating yielded formation ages of 242 Ma for the biotite granite and 240 Ma for the amazonite granite.These granitoid rocks have high K2O with low MgO and CaO contents.They are enriched in Nb,Ta,Hf and Y,while being depleted in Ba and Sr,showing flat HREE patterns and negative Eu anomalies.They have typical A-type granite geochemical signatures with high Ga/Al(8-13)and TFeO/(TFeO + MgO)ratios,showing an A2 affinity for biotite granite and an A1 affinity for amazonite granite and granitic pegmatite.Zircon εHf(t)values of the granitoids are 0.45-2.66,with Hf model ages of 0.99-1.17 Ga.This suggests that these A-type granites originated from partial melting of the lower crust.We propose that Xingxingxia Triassic A-type granites formed under lithospheric extension from post-orogenic to anorogenic intraplate settings and NE-trending regional strike-slip fault-controlled magma emplacement in the upper crust.
TriassicA-type graniteXingxingxiaCentral TianshanCentral Asian orogenic belt
HUANG Zengbao、LI Xiyao、ZHAO Hao、LU Qing
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Geological Survey of Gansu Province,Lanzhou 735000,China
Key Laboratory of Submarine Geosciences and Prospecting Techniques,MOE and College of Marine Geosciences,Ocean University of China,Qingdao,Shandong 266100,China
Research Institute of Petroleum Exploration and Development,Shengli Oilfield,SINOPEC,Dongying,Shandong 257000,China
Shandong Provincial Natural Science FoundationGansu Provincial Natural Science Foundation
国家科技期刊平台
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