本文選題：韌性剪切帶 + 構(gòu)造變形　； 參考：《地質(zhì)通報》2017年06期

【摘要】：中生代巴彥喀拉-松潘甘孜地體向東昆侖地體斜向俯沖,在東昆侖南緣形成一條巨型的韌性剪切帶。剪切帶中發(fā)育的旋轉(zhuǎn)碎斑、書斜構(gòu)造、解理階步、云母魚、S-C組構(gòu)、不對稱褶皺、雁列脈等宏微觀構(gòu)造,顯示剪切帶兼具右行和左行的特征,且右行早于左行剪切,但總體以左行剪切為主。對西大灘糜棱巖化花崗巖和小南川未變形花崗巖進行了LA-ICP-MS鋯石UPb測年,西大灘巖體侵位于199.3±2.2Ma,小南川巖體形成于196.4±1.3Ma。西大灘與小南川巖體中的鋯石為典型的巖漿鋯石,其年齡代表了巖體侵位的時代。鑒于2個巖體的變形程度完全不同,東昆侖南緣在199~196Ma之間發(fā)生了左行韌性剪切。
[Abstract]:A giant ductile shear zone was formed in the southern margin of East Kunlun by the oblique subduction of the Bayankara-Songpan Ganzi terrane in the Mesozoic era. The macro and micro structures developed in the shear zone, such as rotational patchwork, diagonal structure, understanding step, S-C fabric of mica fish, asymmetric fold, echelon vein and so on, show that the shear zone has the characteristics of both right and left rows, and the right line is shearing earlier than the left line. However, the overall left-line shear is the main. The LA-ICP-MS zircon UPb dating of the Xidatan mylonitic granite and the Xiaonanchuan undeformed granite has been carried out. The Xidatan intrusion was located at 199.3 鹵2.2 Ma, and the Xiaonanchuan granite was formed at 196.4 鹵1.3 Ma. The zircon from the Xidatan and Xiaonanchuan pluton is typical magmatic zircon, and its age represents the age of emplacement. Since the deformation degree of the two rock masses is completely different, the left ductile shear occurred between 199~196Ma in the southern edge of East Kunlun.
【作者單位】： 中國地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;青海省地質(zhì)調(diào)查院;
【基金】：青海省地質(zhì)勘查基金項目《青海省昆侖河地區(qū)金多金屬礦整裝勘查區(qū)找礦部署研究》(編號:2016020003ky003) 國家自然科學(xué)基金項目《新疆西天山吐拉蘇淺成低溫?zé)嵋?斑巖型金成礦系統(tǒng)物質(zhì)與時空結(jié)構(gòu)研究》(批準號:41572062)、《內(nèi)蒙古哈達門溝-柳壩溝金礦床堿交代作用與金鉬成礦關(guān)系研究》(批準號:41302064)
【分類號】：P542

【參考文獻】

相關(guān)期刊論文 前10條

1 李小兵;裴先治;陳有p，

本文編號：1921911