Volume 22 Issue 1
Mar.  2016
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LI Bing, ZHANG Yao-ling, WANG Chao-qun, et al., 2016. GEOCHEMICAL CHARACTERISTICS OF THE YOUHULUGOU BASALTS IN THE SUTURE ZONE OF THE NORTH QILIAN MOUNTAIN. Journal of Geomechanics, 22 (1): 48-55.
Citation: LI Bing, ZHANG Yao-ling, WANG Chao-qun, et al., 2016. GEOCHEMICAL CHARACTERISTICS OF THE YOUHULUGOU BASALTS IN THE SUTURE ZONE OF THE NORTH QILIAN MOUNTAIN. Journal of Geomechanics, 22 (1): 48-55.

GEOCHEMICAL CHARACTERISTICS OF THE YOUHULUGOU BASALTS IN THE SUTURE ZONE OF THE NORTH QILIAN MOUNTAIN

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  • Received: 2015-09-15
  • Published: 2016-03-01
  • Geochemical study for the basalt of Youhulugou ophiolite was carried out and discussed its genesis environment. Major and trace element in basalt is one of the representative ophiolite fragments in the suture zone of the North Qilian Mountain. In this study, geochemical study and indicates that the basalts from the Youhulugou ophiolite have N-MORB type characteristics. And according to the REE distribution patterns with no anomaly, the basalts are also similar to mid-ocean ridge basalt. Meanwhile, these basalts are generally depleted in large ion lithophile elements (LILE) of Rb、K and Sr, and high field strength elements (HFSE) are normal, indicating the characteristics of mantle-derived magma from mid oceanic ridge. Tectonic environment discrimination diagrams also suggest that these basalts are typical mid oceanic ridge basalts (MORB). Combined with regional geological characters and geochemical data, we conclude that the Youhulugou basalts represents a part of the dismembered North Qianlian oceanic crust of the era. And the tectonic setting of the North Qilian Ocean was mid-ocean ridge during the late Proterozoic to late Cambrian.

     

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