The Discovery of Late Ordovician Granodiorite in the Xiemisitai Area, Xinjiang and its Geological Significance

• Published in: Acta geologica Sinica (Beijing) Vol. 91; no. 6; pp. 2327 - 2329
• Main Authors: WANG, Juli, HU, Yang, WANG, Jianqi, WANG, Min
• Format: Journal Article
• Language: English
• Published: Richmond Wiley Subscription Services, Inc 01.12.2017; State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China
• Edition: English ed.
• Subjects: Ordovician
• ISSN: 1000-9515; 1755-6724
• DOI: 10.1111/1755-6724.13474

Objective The Xiemisitai area located in the northern part of the West Junggar, Xinjiang is an important component of the central Asian metallogenic domain. Recent studies show that the formation age of acid volcanic and intrusive rocks in the Xiemisitai area mainly ranges from the Late Silurian to the Early Devonian, and the age of the mineralized dacite porphyry is Early Silurian. These rocks are the principal part of the Early Paleozoic arc magmatic belt, which are related to the Paleo-Asian Ocean slab subduction. However, there have been no reports of the pre-Silurian arc granitoid, which has restricted the discussion on the Early Paleozoic tectonic evolution in the area. This work studied the newly discovered granodiorite mass near Yinisala in the Xiemisitai area to determine its formation age and tectonic environment, magma source and petrogenesis, providing new information for the discussion on the Early Paleozoic tectonic evolution in the Xiemisitai area.