藏南拉隆穹窿的厘定及其稀有多金属成矿作用新发现

黄勇; 付建刚; 李光明; 张林奎; 刘洪

doi:10.3799/dqkx.2019.114

Volume 44 Issue 7

Jul. 2019

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Article Navigation > Earth Science > 2019 > 44(7): 2197-2206

Huang Yong, Fu Jiangang, Li Guangming, Zhang Linkui, Liu Hong, 2019. Determination of Lalong Dome in South Tibet and New Discovery of Rare Metal Mineralization. Earth Science, 44(7): 2197-2206. doi: 10.3799/dqkx.2019.114

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Huang Yong, Fu Jiangang, Li Guangming, Zhang Linkui, Liu Hong, 2019. Determination of Lalong Dome in South Tibet and New Discovery of Rare Metal Mineralization. Earth Science, 44(7): 2197-2206. doi: 10.3799/dqkx.2019.114

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Determination of Lalong Dome in South Tibet and New Discovery of Rare Metal Mineralization

doi: 10.3799/dqkx.2019.114

Chengdu Center, China Geological Survey, Chengdu 610086, China

Received Date: 2019-04-11
Publish Date: 2019-07-15

Abstract

Abstract

The Lalong dome is located in the southeast margin of the Tethys-Himalayan tectonic belt, which constitutes another important dome belt parallel to the North Himalayan dome belt along with Cuonadong dome and Kuju dome. The dome is separated by fault into a core unit, a transitional zone and a caprock. The core unit is mainly composed of granitic gneiss, leucogranites and pegmatite. The zircon U-Pb age of granitic gneisses is 474.3±5.5 Ma. Leucogranties mainly consist of two-mica granite and muscovite granite. The transitional zone is composed of garnet schist, cross schist, andalusite schist, kyanite schist, marble, skarn and so on. The caprock is composed of Mesozoic epimetamorphic clastic sedimentary rocks. Three types of rare metal mineralization are recognized. The first type is pegmatite beryllium mineralization. The main beryllium-bearing mineral is beryl. The monazite U-Pb age of pegmatite is 23.19 ±0.12 Ma. The second type is skarn beryllium, tungsten, niobium and tantalum with rare polymetallic mineralization. The monazite U-Pb age of muscovite granite in the contact zone with skarn is 23.23±0.27 Ma. The third type is tectonically controlled hydrothermal Cu-Pb-Zn-Ag mineralization. The rare polymetallic mineralization in Lalong dome shows the zonation characteristics of Be, Be-W-Nb-Ta, Cu-Pb-Zn-Ag mineralization with leucogranite as the core. The determination of the Lalong dome indicates the existence of a "double dome" structural belt in the Tethys-Himalayan metallogenic belt. The discovery of rare polymetallic mineralization in the Lalong dome further confirms that the Tethys-Himalayan metallogenic belt has a huge potential for rare metal prospecting and is expected to become the third rare metal metallogenic belt after South China belt and Altai Xinjiang belt.
- Tethyan-Himalayan,
- Lalong dome,
- rare polymetallic mineralization,
- southern Tibet,
- geochronology

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References(41)

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Determination of Lalong Dome in South Tibet and New Discovery of Rare Metal Mineralization

doi: 10.3799/dqkx.2019.114

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