Provenance and tectonic setting of the Upper Palaeozoic sandstones in western Inner Mongolia (the Shalazhashan and Solonker belts), China: insights from detrital zircon U–Pb ages and Hf isotopes
Provenance and tectonic setting of the Upper Palaeozoic sandstones in western Inner Mongolia (the Shalazhashan and Solonker belts), China: insights from detrital zircon U–Pb ages and Hf isotopes
复制标题
中国内蒙古西部（沙拉扎山和索伦克带）上古生界砂岩的物源和构造背景：来自碎屑锆石U-Pb年龄和Hf同位素的见解
DOI：
10.1017/s0016756817000978
复制
发表时间：
2017-12
影响因子：
2.3
通讯作者：
Li ben
中科院分区：
文献类型：
--
作者：
Shi Guanzhong;Song Guangzeng;Wang Hua;Huang Chuanyan;Li ben
Solonker和Shalazhashan带是中亚造山带中备受争议的构造单元，因为它们既可能代表着中亚造山带的二叠纪或三叠纪缝合带，也可能是叠加在早古生代造山带上的裂谷带。这些带中上古生界砂岩的物源分析可为这一问题提供有益的制约。本研究在三个研究区（Solonker带的满都拉地区、靠近阿拉善地块的沙拉扎山带的曲干曲鲁地区和沙拉扎山带的恩格尔乌斯地区）采集了六个砂岩样品，进行了岩石骨架学、锆石形态、U-Pb和Lu-Hf同位素分析。框架岩相学表明，曼杜拉和恩格尔乌斯地区的样品含有高比例的火山碎屑，而Quagan Qulu地区的样品不仅包括火山碎屑，而且还包括大量的黑云母和白云母。Mandula地区和恩格尔.Us地区的碎屑锆石有两个主要年龄组：（1）260 ~ 330 Ma，εHf（t）值主要为-5 ~+12; (ii)早古生代弧源岩浆岩和晚古生代同沉积火山岩为主要烃源岩。查干曲鲁地区碎屑锆石具有一个420 × 500 Ma的主年龄组，部分年龄组为0.9 × 1.1 Ga、1.4 × 1.5 Ga、1.8 × 1.9 Ga和1.25 Ga，它们来自阿拉善地块的北方边缘。上古生界砂岩的岩性和化石组合表明深水沉积环境和向北加深的过渡。shallowmarine.to根据锆石光谱、沉积环境分析和前人的研究成果，我们认为，中国奥陶系索隆克带和沙拉扎山带是弧前或裂谷背景下的伸展盆地。
The Solonker and Shalazhashan belts are hotly debated tectonic units of the Central Asian.Orogenic Belt (CAOB), because they may either represent a Permian or Triassic suture zone of the.CAOB, or a rifting zone overprinted on an Early Palaeozoic orogen. Provenance analysis of the Upper.Palaeozoic sandstones in these belts may provide useful constraints on this issue. This study collected.six sandstone samples from three study areas: the Mandula area of the Solonker Belt, the Quagan Qulu.area of the Shalazhashan Belt but close to the Alxa block, and the Enger Us area of the Shalazhashan.Belt, for framework petrography, zircon morphology, U–Pb and Lu–Hf isotopic analyses. Framework.petrography reveals that the Mandula and Enger Us area samples contain high proportions of volcanic.fragments, whereas the samples from the Quagan Qulu area include not only volcanic fragments but.also significant amounts of biotite and muscovite. The detrital zircons of the Mandula area and the Enger.Us area yield two main age groups: (i) 260 ̶330 Ma, with dominant εHf(t) values of –5 to +12; and.(ii) 420 ̶550 Ma, with dominant εHf(t) values of –9 to +9, suggesting that Early Palaeozoic arc-related.magmatic rocks and Late Palaeozoic syn-depositional volcanic rocks are the main source rocks. The.detrital zircons of the Quagan Qulu area have one main age group of 420 ̶500 Ma and some grains of.0.9 ̶1.1 Ga, 1.4 ̶1.5 Ga, 1.8 ̶1.9 Ga and ∼ 2.5 Ga, which derive from the northern margin of the Alxa.block. The lithological and fossil assemblages of the Upper Palaeozoic sandstones suggest shallowmarine.to deep-water depositional environments and a northward-deepening transition. Based on the.zircon spectra, sedimentary environment analysis and previous studies, we argue that the Solonker.Belt and the Shalazhashan Belt of the CAOB are in extensional basins of a fore-arc or rifting setting.
登录
查看更多内容
影响因子：
3
作者：
Zeng-Zhen Wang;Bao-Fu Han;L. Feng;Bo Liu
通讯作者：
Zeng-Zhen Wang;Bao-Fu Han;L. Feng;Bo Liu
DOI：
10.1007/s11430-012-4435-y
发表时间：
2012
期刊：
Science China Earth Sciences
影响因子：
--
作者：
Wen Zhang;Tairan Wu;Jicheng Feng;Rongguo Zheng;Yuankai He
通讯作者：
Wen Zhang;Tairan Wu;Jicheng Feng;Rongguo Zheng;Yuankai He
华北克拉通北缘白云鄂博群碎屑锆石U-Pb、Hf同位素及全岩地球化学研究：对Rodinia重建的启示
影响因子：
3.8
作者：
Liu Chaohui;Zhao Guochun;Liu Fulai;Shi Jianrong
通讯作者：
Shi Jianrong
中国西北部阿拉善地块的早二叠世（约280 Ma）硅质火成岩省：由地幔柱引发的岩浆爆发？
影响因子：
3.5
作者：
Xian-Hua Li;Qiang Wang;Gong-Jian Tang;Yu Liu
通讯作者：
Yu Liu
DOI：
10.1146/annurev-earth-060614-105254
发表时间：
2015-06
影响因子：
14.9
作者：
W. Xiao;B. Windley;S. Sun;Jiliang Li;Baochun Huang;Chunming Han;C. Yuan;Minjia Sun;Hanlin Chen-Hanli
通讯作者：
W. Xiao;B. Windley;S. Sun;Jiliang Li;Baochun Huang;Chunming Han;C. Yuan;Minjia Sun;Hanlin Chen-Hanli