U–Pb age, Hf–O isotopes, and geochemistry of the Sardasht ophiolite in the NW Zagros orogen: Implications for the tectonic evolution of Neo‐Tethys,Geological Journal

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U–Pb age, Hf–O isotopes, and geochemistry of the Sardasht ophiolite in the NW Zagros orogen: Implications for the tectonic evolution of Neo‐Tethys
Geological Journal ( IF 1.4 ) Pub Date : 2020-09-24 , DOI: 10.1002/gj.4011
Songjian Ao _{1,

2,

3} , Qigui Mao ₄ , Morteza Khalatbari‐Jafari ₅ , Brian F. Windley ₆ , Dongfang Song _{1,

2,

3} , Zhiyong Zhang _{1,

2,

3} , Ji'en Zhang _{1,

2,

3} , Bo Wan _{1,

2,

3} , Chunnming Han _{1,

2,

3} , Wenjiao Xiao _{1,

2,

3,

7}

Affiliation

Ophiolites in the Zagros orogen represent relics of the Neo‐Tethyan Ocean that existed between the Laurasia and Gondwana continents. There is much debate about the formation and evolution of the Neo‐Tethyan Ocean. Knowledge of its pre‐collisional tectonic evolution is essential in constraining the timing and process of the collision between the Eurasian and Arabian continents. We present a combined analysis of zircon LA–ICP–MS U–Pb ages and Hf–O isotopes of the Sardasht ophiolite from the NW Zagros orogen. Our new data demonstrate that the Sardasht ophiolite formed at ca. 50.6 Ma. Geochemistry of plagiogranite and diabase indicates that the Sardasht ophiolite probably originated in the mantle wedge, influenced by subduction fluids. The mafic rocks of the Sardasht ophiolite include boninites, arc basaltic rocks, and OIBs, which accreted together when the Neo‐Tethys finally closed. Finally, we argue that there was an intra‐oceanic fore‐arc extension and arc system during 50–24 Ma in the southern branch of the Neo‐Tethys in NW Zagros.

中文翻译：

NW Zagros造山带中的U–Pb年龄，Hf–O同位素和Sardasht蛇绿岩的地球化学：对新特提斯构造演化的影响

Zagros造山带中的蛇绿岩代表了新特提斯洋遗迹，该遗迹存在于劳拉西亚大陆和冈瓦纳大陆之间。关于新特提斯洋的形成和演化，存在许多争论。对其碰撞前构造演化的了解对于限制欧亚大陆与阿拉伯大陆之间碰撞的时间和过程至关重要。我们对来自西北Zagros造山带的Sardasht蛇绿岩的锆石LA-ICP-MS U-Pb年龄和Hf-O同位素进行了综合分析。我们的新数据表明，Sardasht蛇绿岩形成于约3年。50.6马。斜长花岗岩和辉绿岩的地球化学表明，Sardasht蛇绿岩可能起源于地幔楔，受到俯冲流体的影响。Sardasht蛇绿岩的镁铁质岩石包括include石，弧形玄武岩和OIB，当新特提斯人最终关闭时，他们共同成长。最后，我们认为在西北Zagros的新特提斯南部分支中，在50-24 Ma内有一个大洋内部的弧前伸展和弧系。

更新日期：2020-09-24

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