Genesis of the Early Mesozoic granitoids at the Hardat Tolgoi Ag-Pb-Zn deposit in East Ujimqin Banner, Inner Mongolia, NE China: insights from whole-rock geochemistry, zircon U-Pb-Hf isotopes, and Pb-Si systematics
Genesis of the Early Mesozoic granitoids at the Hardat Tolgoi Ag-Pb-Zn deposit in East Ujimqin Banner, Inner Mongolia, NE China: insights from whole-rock geochemistry, zircon U-Pb-Hf isotopes, and Pb-Si systematics
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内蒙古东乌珠穆沁旗哈达特陶勒盖银铅锌矿床早中生代花岗岩的成因：全岩地球化学、锆石 U-Pb-Hf 同位素和 Pb-Si 系统学的见解
DOI：
10.1016/j.oregeorev.2021.104530
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发表时间：
2021-10
影响因子：
3.3
通讯作者：
Gu Wen-Xin
中科院分区：
文献类型：
--
作者：
Wang Kang;Lin Shan-Yuan;Wang Yin-Hong;Zhang Fang-Fang;Gu Wen-Xin
哈达特陶勒盖银铅锌存款矿床位于内蒙古大兴安岭西段的二连浩特-东乌珠穆沁多金属成矿带内。银铅锌脉体主要赋存于敖包亭洪迪组泥质粉砂岩和长石石英砂岩中，与哈达特陶勒盖花岗岩类有密切的成因联系（即，黑云母花岗岩、正长花岗岩和二长花岗岩）。新的LA-ICP-MS锆石U-Pb定年结果表明，黑云母花岗岩、正长花岗岩和二长花岗岩的侵位年龄分别为196.1 ± 5.8Ma、192.3 ± 6.0Ma和194.8 ± 1.7Ma，表明它们形成于早侏罗世。岩石地球化学特征为高SiO2、高Na 2 O + K2 O、低MgO、低TiO 2，属高钾钙碱性系列。稀土元素分布相对平坦，Eu负异常明显（EuN/EuN* = 0.004-0.015），富集轻稀土元素和大离子亲石元素（如：Rb、U和Pb），亏损Ba、Sr、Nb、P和Ti。锆石原位Hf同位素分析结果表明，εHf（t）值为+5.7 ~+11.8，对应的地壳模式年龄为452 ~ 843 Ma。花岗岩类样品的206 Pb/204 Pb、207 Pb/204 Pb和208 Pb/204 Pb比值分别为18.950 ~ 19.444、15. 573至15.615和38.487至38.789，分别对应于18.483至18.960、15.552至15.662和37.905至38.193的初始Pb比值，得到的δ 30 Si值在− 0.4至− 0.1‰之间，与石英分离物（−0.7至− 0.1‰）相似。现有的地球化学和同位素资料表明，哈达特陶勒盖的源岩浆最有可能来自年轻的下地壳的部分熔融。结合全岩地球化学和Hf − Pb − Si同位素资料，结合区域构造岩浆演化，认为早侏罗世的岩浆活动可能是蒙古-鄂霍次克洋板块向额尔古纳-吐尔斯克海平面东南方向俯冲的结果，它们的生成对哈尔达特陶勒盖银铅锌矿的形成有利。
The Hardat Tolgoi Ag-Pb-Zn deposit is located in the Erenhot-East Ujimqin polymetallic metallogenic belt, on the western part of the Great Xing’an Range, Inner Mongolia, northeast China. The Ag-Pb-Zn veins are mainly hosted by the argillaceous siltstone and feldspar quartz sandstone of Aobaotinghundi Formation, which show close genetic relationship with the granitoids at Hardat Tolgoi (i.e., biotite granite, syenogranite, and monzogranite). New LA-ICP-MS zircon U-Pb dating yielded the emplacement ages of 196.1 ± 5.8 Ma for biotite granite, 192.3 ± 6.0 Ma for syenogranite, and 194.8 ± 1.7 Ma for monzogranite, respectively, indicating that they were formed in the Early Jurassic. Geochemically, these granitoids are characterized by high SiO2, Na2O + K2O, and low MgO and TiO2concentrations, belonging to high-K calc-alkaline series. They exhibit relatively flat REE patterns, with pronounced negative Eu anomalies (EuN/EuN* = 0.004–0.015), enriched in LREEs and LILEs (e.g., Rb, U, and Pb), and depleted in Ba, Sr, Nb, P, and Ti. Zircon in situ Hf isotopic analyses yield positive εHf(t) values ranging from + 5.7 to + 11.8, corresponding relatively young Hf isotopic crustal model ages of 452 to 843 Ma. The granitoid samples have the206Pb/204Pb,207Pb/204Pb, and208Pb/204Pb ratios of 18.950 to 19.444, 15. 573 to 15.615, and 38.487 to 38.789, corresponding to initial Pb ratios of 18.483 to 18.960, 15.552 to 15.662, and 37.905 to 38.193, respectively, and yield the δ30Si values between − 0.4 and − 0.1‰, similar to the quartz separates (−0.7 to − 0.1‰). The available geochemical and isotopic data imply that the source magma at Hardat Tolgoi was most likely derived from partial melting of juvenile lower crust. Combined our whole-rock geochemical and Hf − Pb − Si isotopic data with regional tectono-magmatic evolution, it is proposed that the Early Jurassic magmatism at Hardat Tolgoi was probably attributed to the southeastward subduction of the Mongol − Okhotsk oceanic plate beneath the Erguna massif, and their generation was favorable to the Hardat Tolgoi Ag-Pb-Zn ore formation.
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DOI：
10.1016/0024-4937(92)90029-x
发表时间：
1992-07
期刊：
--
影响因子：
--
作者：
S. Turner;J. Foden;R. S. Morrison
通讯作者：
S. Turner;J. Foden;R. S. Morrison
蒙古—鄂霍茨克洋板块早中生代向南俯冲历史：来自额尔古纳地块早中生代侵入岩年代学和地球化学的证据
影响因子：
6.1
作者：
Tang Jie;Xu Wenliang;Wang Feng;Zhao Shuo;Wang Wei
通讯作者：
Wang Wei
DOI：
--
发表时间：
2004
期刊：
--
影响因子：
--
作者：
Lu Yuanfa
通讯作者：
Lu Yuanfa
影响因子：
1.4
作者：
F. Nie;Si-hong Jiang
通讯作者：
F. Nie;Si-hong Jiang
影响因子：
5.8
作者：
Shaoyong Jiang;M. Palmer;Ding Ti-ping;Wan Defang
通讯作者：
Shaoyong Jiang;M. Palmer;Ding Ti-ping;Wan Defang