Early Cretaceous (~ 140 Ma) aluminous A-type granites in the Tethyan Himalaya, Tibet: Products of crust-mantle interaction during lithospheric extension
Early Cretaceous (~ 140 Ma) aluminous A-type granites in the Tethyan Himalaya, Tibet: Products of crust-mantle interaction during lithospheric extension
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西藏特提斯喜马拉雅地区早白垩世（~140 Ma）铝质A型花岗岩：岩石圈伸展过程中壳幔相互作用的产物
DOI：
10.1016/j.lithos.2017.11.023
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发表时间：
2018-02
期刊：
影响因子：
3.5
通讯作者：
Hu Wan-Long
中科院分区：
文献类型：
--
作者：
Ma Lin;Kerr Andrew C.;Wang Qiang;Jiang Zi-Qi;Hu Wan-Long
A型花岗岩因其独特的常量和微量元素特征及构造意义而成为研究的热点。然而，它们的岩石成因，岩浆来源和构造环境仍然存在争议，特别是铝A型花岗岩。最早的白垩纪（CA。特提斯喜马拉雅东部科美花岗岩与同时代洋岛玄武岩（OIB）型镁铁质熔岩共生，具有A型花岗岩地球化学特征，高10,000 × Ga/Al（高达6），FeO总/MgO（4.6-6.1）和（Na_2 O + K_2 O）/Al_2 O_3（0.50-0.61）的比值，但CaO（0.6- 1.6wt%）和Na_2 O（1.8- 2.6wt%）含量低。柯美花岗岩的过铝质成分（A/CNK = 1.00-1.36）也是可变的（沿着），锆石δ 18 O、εNd（t）和初始87 Sr/86 Sr值分别为8.2‰-9.3‰、− 13.0-− 12.4和0.7238 - 0.7295。这种成分范围可以解释为高温上涌的OIB型玄武质岩浆与浅地壳（< 5 kbar）变质源区之间的相互作用。Comei花岗岩和同时代的OIB型玄武质岩石可能代表了特提斯喜马拉雅东部大火成岩事件的最早阶段（145-140 Ma），这很可能是由Kerguelen羽头到达之前的解体前岩石圈伸展触发的。
A-type granites have been the focus of considerable research due to their distinctive major- and trace-element signatures and tectonic significance. However, their petrogenesis, magmatic source and tectonic setting remain controversial, particularly for aluminous A-type granites. The earliest Cretaceous (ca. 140 Ma) Comei granite in the eastern Tethyan Himalaya is associated with coeval oceanic island basalt (OIB)-type mafic lava, and has A-type granite geochemical characteristics including high 10,000 × Ga/Al (up to 6), FeOtotal/MgO (4.6–6.1) and (Na2O + K2O)/Al2O3(0.50–0.61) ratios but low CaO (0.6–1.6 wt%) and Na2O (1.8–2.6 wt%) contents. The Comei granite also has variable peraluminous compositions (A/CNK = 1.00–1.36) along with zirconδ18O, εNd(t) and initial87Sr/86Sr values of 8.2‰ to 9.3‰, − 13.0 to − 12.4 and 0.7238 to 0.7295, respectively. This range of compositions can be interpreted as the interaction between high-temperature upwelling OIB type basaltic magmas and a shallow crustal (< 5 kbar) metapelitic source. The Comei granite and coeval OIB type basaltic rock could represent the earliest stage (145–140 Ma) of a large igneous event in eastern Tethyan Himalaya, which may well have been triggered by pre-breakup lithospheric extension prior to the arrival of the Kerguelen plume head.
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影响因子：
3.5
作者：
Di‐Cheng Zhu;X. Mo;G. Pan;Zhidan Zhao;G. Dong;Yuruo Shi;Z. Liao;Li-quan Wang;Changyong Zhou-Changyong
通讯作者：
Di‐Cheng Zhu;X. Mo;G. Pan;Zhidan Zhao;G. Dong;Yuruo Shi;Z. Liao;Li-quan Wang;Changyong Zhou-Changyong
DOI：
10.1016/0024-4937(92)90029-x
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1992-07
期刊：
--
影响因子：
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作者：
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影响因子：
3.5
作者：
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通讯作者：
Chuan-Zhou Liu
DOI：
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发表时间：
2007
期刊：
Acta Geological Sinica
影响因子：
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作者：
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DOI：
--
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2002
期刊：
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