Petrogenesis and Geodynamic Implications of the Carboniferous Granitoids in the Dananhu Belt, Eastern Tianshan Orogenic Belt
Petrogenesis and Geodynamic Implications of the Carboniferous Granitoids in the Dananhu Belt, Eastern Tianshan Orogenic Belt
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东天山造山带大南湖带石炭系花岗岩类岩石成因及其地球动力学意义
DOI：
10.1007/s12583-019-1256-3
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发表时间：
2019-12
影响因子：
3.3
通讯作者：
Xiaoping Long
中科院分区：
文献类型：
--
作者：
Long Du;Chao Yuan;Xuping Li;Yunying Zhang;Zongying Huang;Xiaoping Long
本文系统地研究了东天山造山带大南湖带斑状花岗岩和钾长花岗岩的LA-ICPMS锆石U-Pb年代学、全岩主量元素和微量元素地球化学以及锶-钕同位素。锆石U-Pb定年结果表明，斑状花岗岩和钾长花岗岩分别形成于357±3 Ma和311±3 Ma。斑状花岗岩具有高SiO_2、低镁、低镁、亏损的锶、钕同位素特征(分别为0.703 4和6.13)，Nb/Ta(13.3~14.7)和Zr/Hf(31.0~33.9)与壳源岩浆相近。上述特征表明，它们可能来源于幼年的下地壳物质。钾长花岗岩还具有高SiO_2、低镁和低镁#、亏损的锶-钕同位素(分别为0.703 3~0.704 6和4 41~5 67)。但某些微量元素含量变化较大，Nb/Ta(12.7~22.7)、Zr/Hf(21.3~36.1)和Nb/La(0.38~1.07)比值变化较大，表明钾长花岗岩是由新生下地壳物质与旧地壳物质部分熔融形成的。结合大南湖带石炭纪花岗质岩石的前人资料，推测大南湖带石炭纪花岗质岩体很可能全部侵位于岛弧环境(大南湖弧)。随后，ETOB可能发生了从大洋俯冲到碰撞后伸展的构造转换。
This paper presents new LA-ICP-MS zircon U-Pb geochronology, whole-rock major and trace element geochemistry, and Sr-Nd isotopes systematically on porphyritic granitic and K-feldspar granitic intrusions from the Dananhu belt, eastern Tianshan orogenic belt (ETOB). Zircon U-Pb dating indicates that the porphyritic granitic and K-feldspar granitic plutons were formed at 357±3 and 311±3 Ma, respectively. The porphyritic granites show geochemical and isotopic characteristics (high SiO2, low MgO and Mg#, depleted Sr-Nd isotopic values (about 0.703 4 and 6.13, respectively), with Nb/Ta (13.3–14.7) and Zr/Hf (31.0–33.9) ratios) similar to those of the crustal-derived magmas. The above characteristics suggest they were probably originated from juvenile lower crustal materials. The K-feldspar granites also have high SiO2, low MgO and Mg#, depleted Sr-Nd isotopic values (0.703 3–0.704 6 and 4.41–5.67, respectively). But some trace elements contents vary widely, with variable Nb/Ta (12.7–22.7), Zr/Hf (21.3–36.1) and Nb/La (0.38–1.07) ratios, indicating that the K-feldspar granites were formed by partial melting of juvenile lower crustal materials with old crustal materials. Combined with previous data on Carboniferous granitoids in the Dananhu belt, we infer that all the Carboniferous granitic plutons in the Dananhu belt were most likely emplaced in an island arc environment (Dananhu arc). Subsequently, a tectonic transition from oceanic subduction to post-collisional extension probably occurred in the ETOB.
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