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Workshop of the IGCP project 679 "Cretaceous Earth Dynamics and Climate in Asia" and Business Meeting
Time:
Thursday, 04/Sept/2025:
11:00am - 12:30pm
Session Chair: Gang Li, Nanjing Institute of Geology and Palaoeontology, Chinese Academy of Sciences Session Chair: Takashi Hasegawa, Kanazawa University
Location:C109
Presentations
11:00am - 11:15am ID: 146 Topics: 6a - Cretaceous Earth dynamics and climate in Asia – IGCP 679 (Li, Hasegawa)
Mesozoic and Cenozoic stratigraphy of Zaamar District, Northern Khentii, Mongolia: Insights from K-Ar Dating, Petrography of basalts, and Lower Cretaceous Palynology
1Mongolian University of Science and Technology, Mongolia; 2Gurvantalst LLC; 3Mongolian Academy of Sciences, Institute of Paleontology
The Zaamar district in northern Khentii, Mongolia, represents a critical area for understanding the Mesozoic-Cenozoic evolution of the Central Asian Orogenic Belt. This study presents an integrated analysis of K-Ar geochronology, basalt petrography, and Lower Cretaceous palynology to establish a refined stratigraphic framework for the region. New K-Ar dates reveal two distinct volcanic episodes: Late Cretaceous (92-96 Ma) and Late Miocene (10-12 Ma). Petrographic examination identifies three basalt types (olivine basalt, basalt, and trachybasalt) with distinct mineralogical characteristics. Palynological assemblages from underlying sediments confirm an Albian (Lower Cretaceous) age, providing critical constraints on pre-Cenozoic basement rocks. These findings significantly advance our understanding of the Mesozoic-Cenozoic tectonic and sedimentary evolution of northern Mongolia and provide important insights for regional gold exploration.
