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2021, 40(2) 298-306 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Geochronology of amphibolite from Longshan Group
in Tianshui area and its geological significance |
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JIA Ming-hui,CAO Hua-hua,LI San-zhong,WANG Xue-bin |
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1. Frontiers Science Center for Deep Ocean Multispheres and Earth System and Key Lab of Submarine Geosciences and Prospecting
Techniques,MOE and College of Marine Geosciences,Ocean University of China,Qingdao 266100,Shandong,China;
2. Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266100,
Shandong,China;
3. Rizhao Emergency Management Bureau,Rizhao 276800,Shandong,China |
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Abstract:
In order to define the formation age and structural properties of the ancient basement in the North
Qilian orogen,LA-ICP-MS zircon U-Pb dating of amphibolite in Longshan Group in Tianshui area has been studied.Zircons in amphibolite are euhedral-subhedral with clear internal structure,and typical magmatic oscillatory growth zones are developed. Combined with the high Th /U ratios,zircons are of magmatic origin. The results show that the weighted average age of amphibolite is ( 444 ± 2) Ma,which is the first age of Early Silurian volcanic rocks in Longshan Group. Based on the regional geological data,the authors suggest that the Longshan Group in the North Qilian orogen should be disintegrated into two sets of geological bodies:Paleoproterozoic-Neoproterozoic
ancient crystalline basement rocks and Early Paleozoic metamorphic volcanic-sedimentary rocks. |
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Keywords:
Tianshui area
Longshan Group
amphibolite
geochronology
geological significance
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Received Revised Online: |
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