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Seismic reflection characteristics and evolution of intrusions in the Qiongdongnan Basin: Implications for the rifting of the South China Sea.

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Title: Seismic reflection characteristics and evolution of intrusions in the Qiongdongnan Basin: Implications for the rifting of the South China Sea.
Authors: Zhao, Yanghui1, Tong, Dianjun1, Song, Ying2 yingsong@upc.edu.cn, Yang, Linlong1, Huang, Chao1
Source: Journal of Earth Science. Aug2016, Vol. 27 Issue 4, p642-653. 12p.
Subject Terms: *Geological basins, *Structural geology, *Igneous intrusions, *Geologic faults, *Rifts (Geology)
Abstract: The Qiongdongnan Basin (QDNB) is situated in the extensional zone at the vertex of the V-shaped northwest sub-basin, non-volcanic northern margin of the South China Sea (SCS). From north to south, the thickness of the continental lithosphere decreases from 22 km on the northern continental shelf to 17 km at the deepest area of the central depression. A sharp change on the crustal structure is of importance to hydrocarbon exploration yet the dynamic causes remain unknown. A comprehensive study including (1) interpretation of seismic profiles, (2) P-wave velocity data modeling, and (3) magnetic anomalies analysis reveals that there are some high-density intrusions along the lithospheric thinning belt. Chaotic reflections can be found in the southwest of the QDNB, with a low velocity (<3.4 km/s), while in the center and the east, the intensively deformed strata passing towards the diapir flanks and their high velocities (>6 km/s) suggest the existence of igneous diapirs. Diapirism differentiation are primarily achieved through analysis of the contact relationship and the thickness variations in the surrounding strata. The first phase of diapirism along the Songnan low uplift occurred in the Late Mesozoic, and the second phase of diapirism in a form of subsequent gas movement remained active until the Late Quaternary. The distribution and the evolution of the diapirs would have major implications for post-rift emplacement. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 117124520
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: Seismic reflection characteristics and evolution of intrusions in the Qiongdongnan Basin: Implications for the rifting of the South China Sea.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Journal+of+Earth+Science%22&quot;&gt;Journal of Earth Science&lt;/searchLink&gt;. Aug2016, Vol. 27 Issue 4, p642-653. 12p.
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  Data: *&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Geological+basins%22&quot;&gt;Geological basins&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Structural+geology%22&quot;&gt;Structural geology&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Igneous+intrusions%22&quot;&gt;Igneous intrusions&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Geologic+faults%22&quot;&gt;Geologic faults&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Rifts+%28Geology%29%22&quot;&gt;Rifts (Geology)&lt;/searchLink&gt;
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The Qiongdongnan Basin (QDNB) is situated in the extensional zone at the vertex of the V-shaped northwest sub-basin, non-volcanic northern margin of the South China Sea (SCS). From north to south, the thickness of the continental lithosphere decreases from 22 km on the northern continental shelf to 17 km at the deepest area of the central depression. A sharp change on the crustal structure is of importance to hydrocarbon exploration yet the dynamic causes remain unknown. A comprehensive study including (1) interpretation of seismic profiles, (2) P-wave velocity data modeling, and (3) magnetic anomalies analysis reveals that there are some high-density intrusions along the lithospheric thinning belt. Chaotic reflections can be found in the southwest of the QDNB, with a low velocity (&lt;3.4 km/s), while in the center and the east, the intensively deformed strata passing towards the diapir flanks and their high velocities (&gt;6 km/s) suggest the existence of igneous diapirs. Diapirism differentiation are primarily achieved through analysis of the contact relationship and the thickness variations in the surrounding strata. The first phase of diapirism along the Songnan low uplift occurred in the Late Mesozoic, and the second phase of diapirism in a form of subsequent gas movement remained active until the Late Quaternary. The distribution and the evolution of the diapirs would have major implications for post-rift emplacement. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1007/s12583-016-0708-2
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 12
        StartPage: 642
    Subjects:
      – SubjectFull: Geological basins
        Type: general
      – SubjectFull: Structural geology
        Type: general
      – SubjectFull: Igneous intrusions
        Type: general
      – SubjectFull: Geologic faults
        Type: general
      – SubjectFull: Rifts (Geology)
        Type: general
    Titles:
      – TitleFull: Seismic reflection characteristics and evolution of intrusions in the Qiongdongnan Basin: Implications for the rifting of the South China Sea.
        Type: main
  BibRelationships:
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      – PersonEntity:
          Name:
            NameFull: Zhao, Yanghui
      – PersonEntity:
          Name:
            NameFull: Tong, Dianjun
      – PersonEntity:
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            NameFull: Song, Ying
      – PersonEntity:
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            NameFull: Yang, Linlong
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            NameFull: Huang, Chao
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            – D: 01
              M: 08
              Text: Aug2016
              Type: published
              Y: 2016
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              Value: 27
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            – TitleFull: Journal of Earth Science
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