成都理工大学学报（自然科学版）2025，Vol.52Issue(3)：440-455,16.DOI:10.12474/cdlgzrkx.2024102103
扬子西缘新元古界黄水河群碎屑锆石年代学特征及其对罗迪尼亚超大陆重建的启示
Detrital zircon geochronology of the Neoproterozoic Huangshuihe Group in the Western Yangtze Block,and its implications for the reconstruction of the Rodinia Supercontinent
摘要
Abstract
The precise determination of the depositional timing,provenance characteristics,and tectonic attributes of the Huangshuihe Group along the western margin of the Yangtze Block can provide critical insights into the Neoproterozoic tectonic evolution of this region.This study conducts a systematic petrographic and LA-ICP-MS detrital zircon U-Pb geochronological analysis of metaclastic rocks from the Huangshuihe Group in the Pengguan area.The results show that the youngest detrital zircon ages of two biotite quartz schist samples from the Huangtongjianzi Formation are 840±20 Ma and 844±29 Ma,suggesting a maximum depositional age of approximately 840 Ma for the Huangshuihe Group.The detrital zircon age spectra from the two samples consist of four main age peak intervals:approximately 2687～2350,2228～1629,1533～1413,and 1249～840 Ma,defining a primary peak at around 922 Ma and two secondary peaks at approximately 2499 and 1867 Ma.Comparisons with regional tectono-thermal events and detrital zircon age spectra from coeval strata indicate that the detritus of the Huangshuihe Group in the Pengguan area was primarily sourced from the northwestern margin of the Yangtze Block,with possible contributions from its southwestern and northern margins.Based on the results of this study and previous research,we propose that the meta-clastic rocks of the Huangshuihe Group in the Pengguan area were deposited in a basin associated with an active continental margin along the western Yangtze Block during the early Neoproterozoic,governed by subduction-related dynamics.These lines of evidence jointly locate the Yangtze Block at the exterior periphery of the Rodinia supercontinent in the early Neoproterozoic.关键词
新元古代/扬子板块/黄水河群/碎屑锆石/物源分析Key words
Neoproterozoic/Yangtze Block/Huangshuihe Group/detrital zircon/provenance analysis分类
天文与地球科学引用本文复制引用
李永成,惠博,董云鹏,孙圣思,何登峰,臧儒韬,闫树萱..扬子西缘新元古界黄水河群碎屑锆石年代学特征及其对罗迪尼亚超大陆重建的启示[J].成都理工大学学报（自然科学版）,2025,52(3):440-455,16.基金项目
国家自然科学基金(42202235) （42202235）
西安市科协青年人才托举计划(959202313087). （959202313087）
