2024-03-29T12:03:22Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00016154
2023-01-16T05:18:47Z
367:368:369:1499
Geological division of the rocks at southeast of Ulaanbaatar (Gachuurt-Nalaikh), central Mongolia
Nakane, Yuki
48667
Kurihara, Toshiyuki
48668
Nuramkhaan, Bakhat
48669
Nuramkhaan, Manchuk
48670
Takeuchi, Makoto
48671
Tsukada, Kazuhiro
48672
Gonchigdorj, Sersmaa
48673
Sodnom, Khishigsuren
48674
2012-12-25
This paper describes lithology and radiolarian fossils from a chert slab in the Gachuurt-Nalaikh area, southeast of Ulaanbaatar, central Mongolia, and discusses the geological division of the rocks in this area. The rocks in this area consist of clastic rocks with chert slab intercalations. Although the rocks of this area have been previously divided into the Gorkhi, Altan-Ovoo, and Orgioch-Uul Formations, there are no significant structural and lithological gaps across the boundaries between these formations. Therefore, there is no reason to divide the rocks of this area into the three formations, and these three formations should be regarded as a single geological unit. A conformable succession of Devonian radiolarian chert, siliceous shale, mudstone and sandstone in ascending order, which is generally regarded as ocean plate stratigraphy (OPS), were found from this area. The repetition of chert and clastic rocks with OPS within this area might show the stacking of tectonic slices of the chert-clastic rock sequence within an accretionary complex. This suggests that the rocks of this area should be regarded as the northern extension of the Gorkhi Formation of an accretionary complex, though most of the rocks of this area have been previously assigned to Carboniferous shallow marine system.
departmental bulletin paper
名古屋大学博物館
2012-12-25
名古屋大学博物館報告
28
19
26
http://hdl.handle.net/2237/18187
1346-8286
eng