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首页> 外文期刊>Solid Earth Sciences >Geochronology, geochemistry and Hf–Sr–Nd isotopes of the ore-bearing syenite from the Shapinggou porphyry Mo deposit, East Qinling-Dabie orogenic belt
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Geochronology, geochemistry and Hf–Sr–Nd isotopes of the ore-bearing syenite from the Shapinggou porphyry Mo deposit, East Qinling-Dabie orogenic belt

机译：东秦岭-大别造山带沙坪沟斑岩钼矿床含矿正长岩的年代学，地球化学和Hf-Sr-Nd同位素

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The Shapinggou Mo deposit is located in the western Dabie mountains, the eastern part of the Qinling-Dabie molybdenum orogenic belt. Shapinggou Mo deposit is a concealed deposit with the ore body mainly hosted by explosive breccia of Gaijing and the granite porphyry as well as the syenite of Shapinggou. Geochemistry study show that the SiO2 contents of Shapinggou syenite range from 61.74 to 69.93%, and the A/CNK from 0.95 to 1.06, classified as metaluminous to weak peraluminous, belonging to alkalic to shoshonitic series. The Mo deposits in Qinling Mo belt formed in two main periods, i.e., the first period occurred in to the Early Cretaceous (145–130?Ma), the second period in the late Early Cretaceous (130–110?Ma). Most of the Mo deposits in Dabie region formed in the second period. The results of zircon U–Pb show that the age of the Shapinggou syenite is 111.3?±?1.2?Ma, which belongs to the second period. Proterozoic-Archean inherited zircons suggest that it may include some more ancient crustal material like Kongling group. The ?Hf(t) values of Shapinggou syenite range from ?15.6 to ?8.0, TDM2(Hf) from 1.7 to 2.16?Ga, respectively. The ?Nd(t) values of the Shapinggou syenite range from ?12.29?to ?11.76, TDM2(Nd) from 1.85 to 1.89?Ga, the 87Sr/86Sr from 0.709 to 0.710, respectively. Results of zircon Hf isotope and whole rock Sr–Nd isotope of Shapinggou syenite indicate that the Mo ore-forming materials were mainly generated from old Yangtze craton, e.g., gneiss from Dabie orogeny, mixed with some juvenal mantle materials. The geodynamics of the Shapinggou Mo deposit corresponded to an extension period in Eastern China, which caused by large scale lithospheric thinning. The delamination caused asthenosphere upwelling and crust-mantle interaction, which provided the ore-forming material and heat.
机译：沙坪沟钼矿床位于秦岭-大别钼造山带东部的大别山西部。沙坪沟钼矿床为隐伏矿床，矿体主要为盖井爆炸角砾岩，花岗岩斑岩和沙坪沟正长岩。地球化学研究表明，沙坪沟正长岩的SiO2含量范围为61.74％至69.93％，A / CNK含量范围为0.95至1.06，分类为金属性至弱性高铝质，属于碱度至生辉质系列。秦岭钼带的钼矿床形成主要有两个时期，即第一时期发生在白垩纪早期（145-130？Ma），第二时期发生在白垩纪晚期（130-110？Ma）。大别地区的大部分钼矿床形成于第二时期。锆石U–Pb的结果表明，沙坪沟正长岩的年龄为111.3？±？1.2？Ma，属于第二时期。古生代的Archean锆石表明它可能包括一些更古老的地壳物质，如孔岭群。沙坪沟正长岩的ΔHf（t）值分别在？15.6至？8.0，TDM2（Hf）在1.7至2.16？Ga之间。沙坪沟正长岩的ΔNd（t）值范围为？12.29至？11.76，TDM2（Nd）的范围为1.85至1.89？Ga，87Sr / 86Sr的范围为0.709至0.710。沙坪沟正长岩的锆石Hf同位素和整个岩石Sr-Nd同位素的结果表明，成矿物质主要来自旧的长江克拉通，例如大别造山带的片麻岩，并混合有一些地幔物质。沙坪沟钼矿床的地球动力学对应于中国东部的扩展期，这是由岩石圈大规模减薄引起的。分层导致软流圈上升流和地幔幔相互作用，这提供了成矿物质和热量。

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