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Cenozoic seismic stratigraphy and st...

Wirasantosa, Sugiarta.

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Cenozoic seismic stratigraphy and structure of the continental margin offshore Vietnam, South China Sea.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Cenozoic seismic stratigraphy and structure of the continental margin offshore Vietnam, South China Sea./
作者:	Wirasantosa, Sugiarta.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1992,
面頁冊數:	239 p.
附註:	Source: Dissertation Abstracts International, Volume: 53-08, Section: B, page: 4000.
Contained By:	Dissertation Abstracts International53-08B.
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9300518

Cenozoic seismic stratigraphy and structure of the continental margin offshore Vietnam, South China Sea.
Wirasantosa, Sugiarta.

Cenozoic seismic stratigraphy and structure of the continental margin offshore Vietnam, South China Sea. - Ann Arbor : ProQuest Dissertations & Theses, 1992 - 239 p.

Source: Dissertation Abstracts International, Volume: 53-08, Section: B, page: 4000.

Thesis (Ph.D.)--Texas A&M University, 1992.

Time-structure maps of the basement in the study area show two different sets of faults. These faults trend NNW-SSE in the northern and middle areas and NE-SW in the southern area. Strain ellipse indicates that the fault patterns in the northern area may have been formed by a left-lateral movement. This left-lateral movement may be related to the southeastward extrusion and clockwise rotation of Sundaland during the collision of India and Asia. Faults in the southern area which trend NE-SW may have been initiated during the Paleocene sea-floor spreading in the Southwest subbasin. The faults may have been reactivated during the middle Miocene.Subjects--Topical Terms:

516570
Geology.

Cenozoic seismic stratigraphy and structure of the continental margin offshore Vietnam, South China Sea.
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300 $a 239 p.
500 $a Source: Dissertation Abstracts International, Volume: 53-08, Section: B, page: 4000.
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520 $a Time-structure maps of the basement in the study area show two different sets of faults. These faults trend NNW-SSE in the northern and middle areas and NE-SW in the southern area. Strain ellipse indicates that the fault patterns in the northern area may have been formed by a left-lateral movement. This left-lateral movement may be related to the southeastward extrusion and clockwise rotation of Sundaland during the collision of India and Asia. Faults in the southern area which trend NE-SW may have been initiated during the Paleocene sea-floor spreading in the Southwest subbasin. The faults may have been reactivated during the middle Miocene.
520 $a Cenozoic sediments offshore Vietnam, whose thicknesses range between 0.5 second and more than 4 seconds two-way travel-time, consist of syntectonic and posttectonic sequences. Syntectonic sediments overlie a pronounced rift-onset unconformity. Posttectonic sediments which overlie a breakup unconformity contain five sequences whose ages are inferred to be the upper Oligocene-lower Miocene, lower Miocene-middle Miocene, middle Miocene-upper Miocene, Pliocene and Pleistocene-Recent. Maximum rates of posttectonic sedimentation generally increase throughout the time. The highest increase in sedimentation rates occurred during the Pleistocene-Recent in the middle area. The increase rates of sediment supply may have been related to the widespread volcanism in Indochina during the Pliocene-Recent and to the slight increase in basin subsidence.
520 $a Thirteen seismic facies within posttectonic sequences were recognized and mapped. These facies indicate shelfal deposits, deltaic sediments, turbidite sediments, channel fill deposits, upper fan deposits, and shale diapirs. Shelfal sediments are commonly found in each sequence. Upper fan deposition occurred in the middle area during the upper Oligocene-lower Miocene. Deltaic sediments are found in the lower Miocene-middle Miocene, middle-upper Miocene, and upper Pliocene-Holocene sequences. Shelf-edge progradation and upper slope slumping, which have occurred since the early Miocene, were intensive during the upper Pliocene-Holocene.
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