1997 Fiscal Year Final Research Report Summary
Phanerozoic tectonics and paleobiogeography of Southeast Asia
| Project/Area Number |
08041095
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Field Research |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | University of Tsukuba |
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Principal Investigator |
SASHIDA Katsuo Institute of Geosciences, Associate Professor, 地球科学系, 助教授 (60134201)
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| Co-Investigator(Kenkyū-buntansha) |
PUNYA Charsuri Univ.Churalonkorn, Thailand, Assist.Prof., 講師
APSORN Ampornmaha Geological Survey of Thailand, Senior Geologist, 主任研究員
NIKORN Nakornsri Geological Survey of Thailand, Director, 地質部長
ADACHI Shuko Institute of Geosciences, Assistant Professor, 地球科学系, 講師 (80182997)
UENO Katsumi Institute of Geosciences, Assistant Professor, 地球科学系, 講師 (90241786)
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| Project Period (FY) |
1996 – 1997
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| Keywords | Tethys / Gondwana / Radiolaria / siliceous rocks / terrane |
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| Research Abstract |
Although our laboratory works are still in progress, I briefly summarize our results which have been conducted by the present resarch program. We discriminated well-preserved Middle Triassic radiolarian faunas from siliceous sedimentary rocks which were regarded as Paleozoic rock unit in the Kanchanaburi Area, westem Thailand. This finding is very important to understand the exact timing of the collision between the Shan-Thai and indochina Blocks. Namely, it is cleared that the collision between both two continental blocks is later than Middle Triassic, because the presence of chert which has the characteristics of pelagic and deep sea sediments indicates the evidence of the Paleotethys Ocean which once existed within two continental blocks. Furthemore, radiolarian fauna discriminated form these rocks is quite similar to that of European Tethys, Far East including Japan, Philippines, and Indonesia, which indicates that the same current system was predominant in these are as during Middle Triassic time. We also recovered Early Carboniferous radiolarian fauna from fine-grained siliceous sedimentary rocks distributed in the Chana area, southem Thailand. Previously, similar Carboniferous radiolarian fauna has been reported only from northwestem Europe, Russian Far East and Central United States. The occurrence of this Carboniferous radiolarians is very important to infer the paleobiogeography during Carboniferous time. The geology around the Chana area is estimated as the accretionary complex formed by the collision of two continental blocks because of the presence of the Carboniferous and Middle Triassic cherts, limestone, serpentinites and also ophiolite sequences.
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Research Products
(6 results)
