SEQUENCE STRATIGRAPHY STUDY OF CARBONATE SLOPE DEPOSIT
-
摘要: 通过右江盆地二叠系层序地层研究表明,在海平面升降旋回的各个时期,均有重力流的发育,并显示各自特征的层序内部构型和成因格架。低水位期以盆缘-下斜坡混屑浊积岩为特征,陆棚边缘体系域中重力流相对较少;海侵期重力流以钙屑碎屑流及其再改造砂沉积为主;高水位期重力流沉积厚度大、分布广、成因类型丰富,主要以钙屑塌积岩、颗粒流、液化沉积物流、碎屑流及浊流大量发育为特征。Abstract: Study on the Permian Sequence Stratigraphy of the Youjiang Basin reveals that gravity flow develops during every period of eustatic cycles and it displays individual characteristic internal configuration and genetic framework of sequences.Lowstand is characterized by basin margin-downslope miscellaneous lithic turbidites,and gravity flow is relatively less in shelf marginal systems.During transgressive periods,gravity flow is dominated by calcarenaceous clastic flow and its recomposed sand deposit.The deposit of gravity flow in highstand has large thickness,wide distribution and rich genetic patterns,and is mainly characterized by well-developed calcarenaceous colluvial rocks,grain flow,liquefied sediment flow,clastic flow,and turbidity flow.
-
Key words:
- Sequence Stratigraphy /
- slope systems /
- sequence framework /
- gravity-flow deposit
-
[1] Walder R G et al.Facies Models-Response to sea level change.Geological Association of Canada.1992:349～374 [2] Cook H E.Carbonafe-slope failures as indicators of sea level lowerings.AAPG,1991,75(5):566(abstract) [3] Tose L A.Sequence stratigraphy of mixed carbonate/volcaniclastic slope deposits flanking the Scilicar-Catinaccio Buileup,Dolomites,Italy.In Bradnex R,The northern margin of the Catinaccio Platform,Guide-book Excursion A,1991:17～39 [4] Grammer G M et al.Highstand versus lowstand deposition on carbonate platform margins:insight from Quaternary foreslopes in the Bahamas.Marine Geology,1992,103(1):125～136 [5] Glaser k s et al.High production and highstand shedding from deeply submerged carbonate banks,northern Nicarahuan Rise.Journal of Sedimentary Petrology,1991,61(2):128～142 [6] Chiocci F L.Effect of sea-level variation on upper-slope depositional processes offshore of Tiber delta,Italy.Marine Geology,1992,104(2):109～122 [7] Trincardi F.Collapse and flow of lowstand shelf-margin deposits:An example from the eastern Tyrrhenian Sea,Marine Geology,1992,105(4):77～94 [8] Steinhauff D M.Recognizing exposure,drowning,and "missing beats":platform-interior to platform-margin seqnence stratigraphy of middle Ordovician,east Tennessee.Journal of Sedimentary Research,1995,65(2):183～207 [9] Melim L A et al.The forereef facies of the Permian Caption Formation:Therole of sediment supply versus sea-level change.Journal of Sedimentary Research,1995,65(1):107～118 [10] Schlager W.Submarine slipe angles,drowning unconformities,and selferosion of limestone escarpments.Geology,1986,14(1):726～765 [11] Masetti D.Deep-water asymmetric cycles and progradation of carbonate platforms governed by high-frequency eustatic ationsoscill.Geology,1991,79(7):336～339 [12] Mullins H T et al.Three-dimensional sedimentary fromeword of central west Florida:A sequential seismic stratigraphic perspective.Geological Society of America,Bulletin,1988,100(4):514～538 -
计量
- 文章访问数: 661
- HTML全文浏览量: 62
- PDF下载量: 449
- 被引次数: 0
下载:
苏公网安备32021102000780号