珠江口盆地白云凹陷海底峡谷沉积模式
|
摘要
利用高分辨率三维地震资料,在珠江口白云凹陷三维工区中发现形态以及发育特征相似的7个海底峡谷。通过对其现今地貌特征研究,将其分为上、中、下段。综合地震反射振幅、连续性及外部结构形态等信息,识别出了峡谷侵蚀基底、谷底沉积、谷壁滑塌等峡谷地震相单元。结合峡谷不同位置处的各类地震相的发育情况,可知峡谷的这3个地貌单元具有不同的沉积特点,分别为上部侵蚀下切段、中部侵蚀—沉积段以及下部沉积充填段。最终提出了白云凹陷海底峡谷的沉积模式。
Based on the high resolution 3D seismic data,seven submarine canyons are studied on their morphological and sedimentary characteristics in a block in the Baiyun Sag,northern South China Sea.Upon morphological features,the canyons are divided into three segments,namely upper,middle and lower segments.According to the continuity and amplitude of the reflection,integrated with seismic reflection configuration,the basal erosional discontinuity and two seismic facies,i.e.thalweg facies and slide facies,were recognized.The upper reach of a canyon is an erosional area characterized by the erosional discontinuity.In stead,the lower reach is in fact a depositional area,while the middle reach is characterized by the coexistence of erosional and depositional features.A depositional model for the submarine canyons in the Baiyun Sag is proposed as the results of the study.
Based on the high resolution 3D seismic data,seven submarine canyons are studied on their morphological and sedimentary characteristics in a block in the Baiyun Sag,northern South China Sea.Upon morphological features,the canyons are divided into three segments,namely upper,middle and lower segments.According to the continuity and amplitude of the reflection,integrated with seismic reflection configuration,the basal erosional discontinuity and two seismic facies,i.e.thalweg facies and slide facies,were recognized.The upper reach of a canyon is an erosional area characterized by the erosional discontinuity.In stead,the lower reach is in fact a depositional area,while the middle reach is characterized by the coexistence of erosional and depositional features.A depositional model for the submarine canyons in the Baiyun Sag is proposed as the results of the study.
引文
[1]Baztan J,Berne S,Olivet J,et al.Axial incision:the key tounderstand submarine canyon evolution(in the westernGulf of Lion)[J].Marine and Petroleum Geology,2005,22:805-826.
[2]Canals M,Casamor J L,Lastras G,et al.The role of Can-yons on strata formation[J].Oceanography,2004,17(4):80-91.
[3]Durrieu de Madron X.Hydrography and nepheloid struc-tures in the Grand-R hone canyon[J].Continental Shelf Re-search,1994,14(5):457-477.
[4]Lewis K B,Barnes P M.Kaikoura Canyon,New Zealand:active conduit fromnearshore sedi ment zones to trench-axischannel[J].Marine Geology,1999,162:39-69.
[5]Mullenbach B L,Nittrouer C A.Rapid deposition of fluvialsedi ment in the Eel Canyon,northern California[J].Conti-nental Shelf Research,2000,20:2 191-2 212.
[6]Schmidt S,de Strigter H C,van Weering T C E.Enhancedshort-termsedi ment deposition within the Nazare Canyon,North-East Atlantic[J].Marine Geology,2001,173:55-67.
[7]Laursen J,Normark W.Late Quaternary evolution of theSan Antonio Submarine canyonin the central Chile Forearc(~338S)[J].Marine Geology,2002,188:365-390.
[8]Clark J D,Pickering K T.Submarine Channels:Processesand Architecture[M].London:Vallis Press,1996:231.
[9]Stow D A V,Mayall M.Deep-water sedi mentary systems:new models for the 21st century[J].Marine and PetroleumGeology,2000,17:125-135.
[10]Posamentier H W.Depositional elements associated with abasin floor channel-levee system:case study from Gulf ofMexico[J].Marine and Petroleum Geology,2003,20:677-690.
[11]韩喜彬,李家彪,龙江平,等.我国海底峡谷研究进展[J].海洋地质动态,2010,26(2):41-48.
[12]Cirac P,Bourillet J F,Griboulard R,et al.Canyon of Cap-breton:new morphostructural and morphosedi mentary ap-proaches,first results of the ITSAS cruise[J].Earth andPlanetary Sciences,2001,332:447-455.
[13]汪品先.新生代亚洲变形与海陆相互作用[J].地球科学(中国地质大学学报),2005,30(1):1-18.
[14]Pratson L F,Ryan WB F,Mountain G S,et al.Submarinecanyon initiation by downslope-eroding sedi ment flows:evidence in late Cenozoic strata on the New Jersey conti-nental slope[J].Geological Society of America Bulletin,1994,106:395-412.
[15]张志杰,于兴河.南海西沙海槽典型地震相识别与分析[J].海洋地质动态,2005,21(1):40-44.
[16]Bouma A H,Normark W R,Barnes N E.Submarine Fansand Related Turbidite Systems[M].Berlin:Springer,1985:351.
[17]Bouma A H.Coarse-grained andfine-grained turbidite sys-tems as end member models:applicability and dangers[J].Marine and Petroleum Geology,2000,17(2):137-143.
[18]Stow D A V,Shanmugam G.Sequence of structures infine-grained turbidites:comparison of recent deep-sea andancient flysch sedi ments[J].Sedi mentary Geology,1980,25(1/2):23-42.
[19]PopescuI,Lericolais G,Panin N,et al.The Danube subma-rine canyon(Black Sea):morphology and sedi mentaryprocesses[J].Marine Geology,2004,206:249-265.
[20]Pratson L,Coakley B J.A model for the headward erosionof submarine canyons induced by downslope-eroding sedi-ment flows[J].Geological Society of America Bulletin,1996,108:225-234.
[21]Sultan N,Gaudin M,Berne S,et al.Analysis of slope fail-uresin submarine canyon heads:an example fromthe Gulfof Lions[J].Geophysics Research,2007,112.
[2]Canals M,Casamor J L,Lastras G,et al.The role of Can-yons on strata formation[J].Oceanography,2004,17(4):80-91.
[3]Durrieu de Madron X.Hydrography and nepheloid struc-tures in the Grand-R hone canyon[J].Continental Shelf Re-search,1994,14(5):457-477.
[4]Lewis K B,Barnes P M.Kaikoura Canyon,New Zealand:active conduit fromnearshore sedi ment zones to trench-axischannel[J].Marine Geology,1999,162:39-69.
[5]Mullenbach B L,Nittrouer C A.Rapid deposition of fluvialsedi ment in the Eel Canyon,northern California[J].Conti-nental Shelf Research,2000,20:2 191-2 212.
[6]Schmidt S,de Strigter H C,van Weering T C E.Enhancedshort-termsedi ment deposition within the Nazare Canyon,North-East Atlantic[J].Marine Geology,2001,173:55-67.
[7]Laursen J,Normark W.Late Quaternary evolution of theSan Antonio Submarine canyonin the central Chile Forearc(~338S)[J].Marine Geology,2002,188:365-390.
[8]Clark J D,Pickering K T.Submarine Channels:Processesand Architecture[M].London:Vallis Press,1996:231.
[9]Stow D A V,Mayall M.Deep-water sedi mentary systems:new models for the 21st century[J].Marine and PetroleumGeology,2000,17:125-135.
[10]Posamentier H W.Depositional elements associated with abasin floor channel-levee system:case study from Gulf ofMexico[J].Marine and Petroleum Geology,2003,20:677-690.
[11]韩喜彬,李家彪,龙江平,等.我国海底峡谷研究进展[J].海洋地质动态,2010,26(2):41-48.
[12]Cirac P,Bourillet J F,Griboulard R,et al.Canyon of Cap-breton:new morphostructural and morphosedi mentary ap-proaches,first results of the ITSAS cruise[J].Earth andPlanetary Sciences,2001,332:447-455.
[13]汪品先.新生代亚洲变形与海陆相互作用[J].地球科学(中国地质大学学报),2005,30(1):1-18.
[14]Pratson L F,Ryan WB F,Mountain G S,et al.Submarinecanyon initiation by downslope-eroding sedi ment flows:evidence in late Cenozoic strata on the New Jersey conti-nental slope[J].Geological Society of America Bulletin,1994,106:395-412.
[15]张志杰,于兴河.南海西沙海槽典型地震相识别与分析[J].海洋地质动态,2005,21(1):40-44.
[16]Bouma A H,Normark W R,Barnes N E.Submarine Fansand Related Turbidite Systems[M].Berlin:Springer,1985:351.
[17]Bouma A H.Coarse-grained andfine-grained turbidite sys-tems as end member models:applicability and dangers[J].Marine and Petroleum Geology,2000,17(2):137-143.
[18]Stow D A V,Shanmugam G.Sequence of structures infine-grained turbidites:comparison of recent deep-sea andancient flysch sedi ments[J].Sedi mentary Geology,1980,25(1/2):23-42.
[19]PopescuI,Lericolais G,Panin N,et al.The Danube subma-rine canyon(Black Sea):morphology and sedi mentaryprocesses[J].Marine Geology,2004,206:249-265.
[20]Pratson L,Coakley B J.A model for the headward erosionof submarine canyons induced by downslope-eroding sedi-ment flows[J].Geological Society of America Bulletin,1996,108:225-234.
[21]Sultan N,Gaudin M,Berne S,et al.Analysis of slope fail-uresin submarine canyon heads:an example fromthe Gulfof Lions[J].Geophysics Research,2007,112.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心