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Geochemistry and U-Pb ages of the diabases from the Luoji area, western Yunnan, China: Implications for the timing of the initial rifting of the Ganzi-Litang Ocean
Wang, C.
;
Liu, H. ✉
;
Feng, H.
;
Deng, J.
;
Liu, X.
;
Zhao, F.
Angol nyelvű Tudományos Szakcikk (Folyóiratcikk)
Megjelent:
GEOLOGIA CROATICA 1330-030X 1333-4875
72
(Special Issue)
pp. 19-32
2019
SJR Scopus - Earth and Planetary Sciences (miscellaneous): Q2
Azonosítók
MTMT: 31146241
DOI:
10.4154/gc.2019.25
WoS:
000505931700003
Scopus:
85077623273
Detailed geochemical and U-Pb studies of two diabases (Luoji and Cuiyi) from the Luoji area have been undertaken. The diabases are high-K calc-alkaline and belonging to the tholeiitic series, enriched in large ion lithophile elements, Ti, Zr and light rare earth elements, and depleted in high field strength elements. These characteristics are different from the oceanic island basalt but highly consistent with the continental rift basalt, indicating the Luoji and Cuiyi diabases are the products of the intracontinental rift related to the initial opening of the Ganzi-Litang Ocean. The Luoji and Cuiyi diabases originated from an enriched mantle source with a small degree of crustal contamination during their emplacement. Zircon U-Pb ages show that the Luoji and Cuiyi diabases were emplaced at 293.4±5.4Ma. Therefore, we propose that the time of initial rifting of the Ganzi-Litang Ocean occurred during the very Early Permian. © 2019, Croatian Geological Survey. All rights reserved.
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