Geochemical characteristics and geological significance of clastic rocks of Naij Tal Group in Laningzaohuo area,East Kunlun
The Naij Tal Group clastic rocks are widely exposed in the East Kunlun,which has important geological significance for the restoration of regional tectonic evolution.In this paper,the weathering conditions,tectonic setting and provenance characteristics of the Naij Tal Group clastic rocks in the Laningzaohuo area are discussed through petrographic and geochemical studies.The results show that the Naij Tal Group clastic rocks in the study area are mainly composed of unstable wackes and litharenite.The content of SiO2 is 54.34％～76.06％,and the content of TFe2O3+MgO is 3.25％～13.82％.The REE patterns are characterized by LREE enrichment,flat HREE and negative δEu anomalies.The low CIA values(53～74)and high ICV values(0.96～1.18)indicate that these sediments were derived from source rocks with low-moderate weathering and dry-warm humid climate.The tectonic setting discrimination diagrams show that the main provenance should come from quartzite sediment source area and felsic igneous provenance area with active continental margin and continental island arc.Moreover,there is the addition of ancient sedimentary components in the deposition process.According to the comparative analysis,the main provenances are the Neoproterozoic magmatic rock,the Early Paleozoic island arc granite,the Baishahe Formation,Xiaomiao Group and Wanbaogou Group.
Naij Tal Group clastic rocksWeatheringTectonic settingProvenanceEast Kunlun
万方数据
维普
