| Citation: |
ZHANG Zhi, ZHANG Lin-kui, LI Guang-ming, LIANG Wei, XIA Xiang-biao, FU Jian-gang, DONG Sui-liang, MA Guo-tao. The Cuonadong Gneiss Dome of North Himalaya: A New Member of Gneiss Dome and a New Proposition for the Ore-controlling Role of North Himalaya Gneiss Domes[J]. Acta Geoscientica Sinica, 2017, (5): 754-766. doi: 10.3975/cagsb.2017.05.15
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The Cuonadong Gneiss Dome of North Himalaya: A New Member of Gneiss Dome and a New Proposition for the Ore-controlling Role of North Himalaya Gneiss Domes
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Abstract
The Cuonadong gneiss dome is a newly discovered dome in the North Himalaya Gneiss Domes (NHGD) belt, which is near the southern Tibetan detachment system, southern Tethys Himalaya. Based on the detailed field work, the authors made a comprehensive description of the structure of the Cuonadong gneiss dome for the first time, and studied the chronology of gneiss. The results show that the Cuonadong gneiss dome is composed of three parts. The core is composed of gneiss and leucogranites and a large number of pegmatite veins. The mantle part is composed of mica schist, with the metamorphic zoning characteristics of sillimanite+garnet→ kyanite + garnet→staurolite + garnet→garnet + staurolite + cordierite→cordierite + garnet from inside to outside. The outer part is mainly composed of metamorphic sedimentary rocks, which have many A-folds due to the rise of the dome. Zircon U-Pb age of the gneiss is (499.7±3.4) Ma (MSWD=0.025), which is consistent with data of other gneiss in the NHGD, suggesting that both are products of the Pan-African and Early Paleozoic orogenic events. During the field geological survey, the authors discovered the skarn type W-Sn-Be-Cu-Au orebody and a large number of gemstones such as beryl in the pegmatite. This mineralization and mineralization combination was discovered in NHGD for the first time, and a new proposition for the ore-controlling role of NHGD was thus established.-
Keywords:
- gneiss dome /
- granitic gneiss /
- metamorphic zoning /
- Cuonadong /
- North Himalaya
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ZHANG Zhi, ZHANG Lin-kui, LI Guang-ming, LIANG Wei, XIA Xiang-biao, FU Jian-gang, DONG Sui-liang, MA Guo-tao. The Cuonadong Gneiss Dome of North Himalaya: A New Member of Gneiss Dome and a New Proposition for the Ore-controlling Role of North Himalaya Gneiss Domes[J]. Acta Geoscientica Sinica, 2017, (5): 754-766. doi: 10.3975/cagsb.2017.05.15
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