冀东金宝沟花岗斑岩地球化学特征、LA-ICP-MS锆石U-Pb年龄和Hf同位素及其地质意义

李曼; 柴凤梅; 叶会寿; 苏慧敏; 路东宇; 张丽颖; 张海滨

冀东金宝沟花岗斑岩地球化学特征、LA-ICP-MS锆石U-Pb年龄和Hf同位素及其地质意义

1. 新疆大学地质与矿业工程学院, 新疆乌鲁木齐 830049;
2. 中国地质科学院矿产资源研究所, 国土资源部成矿作用与资源评价重点开放实验室, 北京 100037;
3. 中国地质大学(武汉), 湖北武汉 430074;
4. 中国地质大学, 北京 100083;
5. 河北省东梁金矿有限公司, 河北宽城 067600

收稿日期: 2015-09-17

修回日期: 2016-02-25

刊出日期: 2016-05-15

LA-ICP-MS zircon U-Pb ages, geochemistry and Hf isotopic composition of Jinbaogou granite porphyry in eastern Hebei and their geological implications

1. College of Geology and Mining Engineering, Xinjiang University, Urumqi 830049, Xinjiang, China;
2. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;
3. China University of Geosciences, Wuhan 430074, Hubei, China;
4. China University of Geosciences, Beijing 100083, China;
5. Dongliang gold Co., Ltd., Kuancheng 067600, Hebei, China

Received Date: 17 September 2015

Revised Date: 25 February 2016

Publish Date: 15 May 2016

摘要

摘要: 金宝沟金矿床是冀东地区近年查明的一个大型斑岩型金矿床,金矿体主要赋存于金宝沟花岗斑岩体及岩体与太古宙迁西群黑云角闪斜长片麻岩接触带中。为查明金宝沟含矿花岗斑岩体的成岩时代、岩石地球化学特征、岩浆源区特征及其与区域上峪耳崖、牛心山等成矿花岗岩体的关系,采用LA-ICP-MS锆石U-Pb定年方法,测得金宝沟2件花岗斑岩的成岩年龄分别为169.9±1.0Ma和170.4±2.0Ma,表明其形成于中侏罗世。金宝沟花岗斑岩属于过铝质钾玄岩系列岩石,ΣREE含量为38.17×10^-6~136.51×10^-6,岩石富集Rb、K等大离子亲石元素和Ba、Th、U,亏损Ta、Nb、Ti等高场强元素和P、Sr,显示出典型岛弧或活动大陆边缘岩浆岩的特征。锆石Hf同位素研究显示,2件花岗斑岩样品的锆石ε_Hf(t)分别为-12.8~-7.4和-14.4~-8.8,两阶段模式年龄分别为1685~2028Ma和1773~2130Ma,暗示岩浆可能来源于古元古代地壳物质的部分熔融。金宝沟花岗斑岩岩浆形成的温度为788~834℃,岩浆形成压力为0.8~1.6GPa。结合区域地质资料认为,包括金宝沟花岗斑岩在内的冀东中侏罗世花岗岩及同时代的髫髻山组火山岩是在陆内收缩、地壳增厚、古太平洋板块向欧亚大陆俯冲的构造背景下,在挤压应力松弛的间隙环境侵位的。
Abstract: The Jinbaogou gold deposit in eastern Hebei has been recently identified as a large porphyry gold deposit. The orebodies mainly occur in Jinbaogou granite porphyry and the contact zone between the granite porphyry and the biotite-hornblende plagiogneiss of Archean Qian'xi Group. In order to confirm the age, geochemistry,magma source characteristics of Jinbaogou granite porphyry and its relationship with Yu'erya and Niuxinshan granites, the authors conducted LA-ICP-MS zircon U-Pb dating of the two granite porphyries, which yielded ages of 169.9±1.0Ma and 170.4±2.0Ma, suggesting the products of Middle Jurassic. Jinbaogou granite porphyry falls into the peraluminous and shoshonite series, its total values of REE are 38.17×10^-6~136.51×10^-6; and the rock is characterized by enrichment of large lithophile elements (Rb, K) and Ba, Th, U but depletion of high-field strength elements (Ta, Nb, Ti) and P, Sr, displaying the characteristics of typical island arc or magmatic rocks of active continental margin. Zircon Hf isotope studies show that the ε_Hf(t) values and T_DM2 ages of two granite porphyry samples are -12.8~-7.4 and -14.4~-8.8, 1685~2028Ma and 1773~2130Ma, respectively, implying representatives of the Paleoproterozoic crustal reservoir. Integrated with the regional geological materials, it is considered that the Middle Jurassic granites in the eastern Hebei, including the Jinbaogou granite porphyry and volcanics of Tiaojishan, were under the tectonic settingsof crustal thickening and the subduction of ancient Pacific plate towards Eurasian plate, and were emplaced during the relaxation after extrusion stress.
- LA-ICP-MS zircon U-Pb ages /
- geochemistry /
- Hf isotope /
- Jinbaogou granite porphyry /
- Middle Jurassic /
- eastern Hebei Province

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冀东金宝沟花岗斑岩地球化学特征、LA-ICP-MS锆石U-Pb年龄和Hf同位素及其地质意义

LA-ICP-MS zircon U-Pb ages, geochemistry and Hf isotopic composition of Jinbaogou granite porphyry in eastern Hebei and their geological implications

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