Cassiterite U-Pb dating of the lower Cretaceous Yanbei tin porphyry district in the Mikengshan volcanic basin, SE China
Cassiterite U-Pb dating of the lower Cretaceous Yanbei tin porphyry district in the Mikengshan volcanic basin, SE China
复制标题
米坑山火山盆地下白垩统雁北锡斑岩区锡石U-Pb定年
DOI：
10.1016/j.oregeorev.2021.104151
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发表时间：
2021-04
影响因子：
3.3
通讯作者：
Chengyao Jiang
中科院分区：
文献类型：
--
作者：
Peng Liu;Jingwen Mao;Bernd Lehmann;Linlin Peng;Rongqing Zhang;Fangyue Wang;Guoan Lu;Chengyao Jiang
燕北锡斑岩区赋存于南岭山脉东南部的下白垩统米坑山火山盆地中，总储量约25万t。在8 × 8 km大的米坑山火山-深部杂岩侵入中心，发现了若干花状、网状和脉状的锡矿床。锡石LA-ICP-MS U-Pb测年结果显示，燕北矿年龄分别为130.4±4.0 Ma、132.0±1.5 Ma和133.5±1.7 Ma，桃溪坝矿年龄分别为135.9±1.5 Ma和136.7±1.4 Ma，光北矿年龄分别为135.1±4.0 Ma。这些资料在误差范围内重叠，表明三个矿床属于同一锡矿体系。结合前人的年代学资料，提出了米坑山盆地斑岩锡矿体系的远景设想。形成于约140 Ma的英长质至流纹岩火山岩和次火山岩，被高度演化的岩浆浅层侵入，释放岩浆热液，在花岗质岩石中形成细脉浸染和灰色矿石，在火山和次火山包裹层中形成远端网状和脉状锡矿化。密坑山火山盆地斑岩锡矿床是华南145 ~ 135马锡成矿事件的一部分。南岭山脉东部早白垩世火山盆地是锡矿勘查的理想靶区。
The Yanbei tin porphyry district with a total resource of about 250,000 t Sn is hosted in the Lower Cretaceous Mikengshan volcanic basin in the southeastern part of the Nanling Range. There are several tin deposits of greisen, stockwork and vein styles associated to the intrusive center of the 8 × 8 km large Mikengshan volcano-plutonic complex. LA-ICP-MS U-Pb dating of cassiterite yielded ages of 130.4 ± 4.0 Ma, 132.0 ± 1.5 Ma and 133.5 ± 1.7 Ma for the Yanbei deposit, 135.9 ± 1.5 Ma and 136.7 ± 1.4 Ma for the Taoxiba deposit, and 135.1 ± 4.0 Ma for the Kuangbei deposit. These data overlap within error and indicate that the three deposits belong to a same tin mineral system. Combined with the previous geochronological data, we propose a scenario for the porphyry tin mineral system in the Mikengshan basin. Dacitic to rhyolitic volcanic and subvolcanic rocks formed at ca. 140 Ma, and were shallowly intruded by highly evolved magmas which released magmatic-hydrothermal fluids to form veinlet-disseminated and greisen ore in the granitic rocks, and more distal stockwork and vein tin mineralization in the volcanic and subvolcanic envelope. The porphyry tin deposits in the Mikengshan volcanic basin are part of the 145–135 Ma tin metallogenic event in South China. The Early Cretaceous volcanic basins in the eastern part of the Nanling Range are promising targets for tin exploration.
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DOI：
10.1144/gsl.sp.1977.007.01.14
发表时间：
1977
期刊：
Geological Society, London, Special Publications
影响因子：
--
作者：
J. Grant;C. Halls;W. Avila;G. Ávila
通讯作者：
J. Grant;C. Halls;W. Avila;G. Ávila
影响因子：
5.8
作者：
Peng Liu;J. Mao;M. Santosh;Lingang Xu;Rongqing Zhang;Lihui Jia
通讯作者：
Peng Liu;J. Mao;M. Santosh;Lingang Xu;Rongqing Zhang;Lihui Jia
影响因子：
5.8
作者：
R. Larson
通讯作者：
R. Larson
影响因子：
4.8
作者：
S. Bergstöl;F. M. Vokes
通讯作者：
S. Bergstöl;F. M. Vokes
影响因子：
5.8
作者：
Shunda Yuan;A. Williams-Jones;J. Mao;Pan Zhao;Chen Yan;Dongliang Zhang
通讯作者：
Shunda Yuan;A. Williams-Jones;J. Mao;Pan Zhao;Chen Yan;Dongliang Zhang