Geological transect through the Hangay-Hentey Basin: Implications for the contraction of the Mongol-...

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" Geological transect through the Hangay-Hentey Basin: Implications for the contraction of the Mongol-Okhotsk Ocean, Mongolia "
Angela E. Ribeiro T. Kelty

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	54105
Doc. No	:	TL24059
Call number	:	‭1455503‬
Main Entry	:	Angela E. Ribeiro
Title & Author	:	Geological transect through the Hangay-Hentey Basin: Implications for the contraction of the Mongol-Okhotsk Ocean, Mongolia\ Angela E. Ribeiro
College	:	California State University, Long Beach
Date	:	2008
Degree	:	M.S.
student score	:	2008
Page No	:	160
Abstract	:	The Hangay Hentey (H-H) Basin may hold key evidence of the tectonic setting and history of the Mongol-Okhotsk (M-O) ocean basin. Due to the tectonic complexity of the region, the history, basin type, closure and location of the M-O ocean are key to unraveling the tectonic history of the Central Asian Orogenic Belt. This study provides lithologic and sedimentological evidence through a series of measured stratigraphic sections distributed across ∼400 kilometers of the H-H Basin. These data are used in conjunction with petrographic analyses and high-precision geochronologic dating of detrital-zircon. Approximately 75% of the zircon grains are Lower Carboniferous age; the source being the Carboniferous calc-alkaline magmatic arc located in northern Mongolia and southern Russia. This age distribution characterizes the sediment package of the H-H Basin as being deposited in an isolated forearc that was subsequently incorporated into a subduction-accretion complex along the northern edge of the Mongolian continental block.
Subject	:	Earth sciences; Geology; 0372:Geology
Added Entry	:	T. Kelty
Added Entry	:	California State University, Long Beach