期刊
PRECAMBRIAN RESEARCH
卷 257, 期 -, 页码 47-64出版社
ELSEVIER
DOI: 10.1016/j.precamres.2014.11.017
关键词
Zhulongguan basalts; Continental rifting; Late Neoproterozoic; Qilian-Qaidam block; Breakup of East Gondwana
资金
- Major State Basic Research Development Program [2015CB856105]
- Basic geological survey program of China Geological Survey [1212011121258]
- National Natural Science Foundation of China [41372060, 40825007, 41121062, 41130314]
We report a sequence of thick, well-preserved basaltic lavas interlayered with shallow marine dolomitic carbonates, mudstones and siltstones of the Zhulongguan Group, in the western segment of the North Qilian orogen, northwest China. Two new zircon SIMS ages show that this sequence formed at similar to 600-580 Ma. The mafic volcanics can be subdivided into tholeiitic and alkaline basalts, and have compositions similar to present-day ocean island basalt (OIB) or continental flood basalts. The occurrence, geochemical features and age data suggest that the Zhulongguan basalts originated at a continental rift setting in the latest Neoproterozoic, within the north margin of the Qilian-Qaidam block. This volcanic-sedimentary formation exhibits close affinity to the passive continental margin in southeastern Australia. Our observations favor a link of the Qilian-Qaidam block with SE Australia (also south China) during the breakup of Rodinia, thereby filling a void in existing reconstructions of the region. (C) 2014 Elsevier B.V. All rights reserved.
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