DOI: 10.1007/s00531-013-0913-5
Scopus记录号: 2-s2.0-84885913190
论文题名: Bucket structure in carbonate accumulations of the Maldive, Chagos and Laccadive archipelagos
作者: Schlager W. ; Purkis S.J.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 8 起始页码: 2225
结束页码: 2238
语种: 英语
英文关键词: Atoll
; Carbonate platform
; Fractal
; Nutrient uptake
; Ring reef
; Shelf edge
; Size-frequency analysis
Scopus关键词: atoll
; carbonate platform
; coastal lagoon
; depositional environment
; fractal analysis
; frequency analysis
; nutrient uptake
; Oligocene
; remote sensing
; satellite data
; shelf break
; size structure
; British Indian Ocean Territory
; Chagos Archipelago
; India
; Lakshadweep
; Maldives
英文摘要: Peritidal platforms rimmed by reefs, and raised reefs rimming deep lagoons, are characteristic morphologies of the tropical carbonate factory; their geometry contrasts sharply with the seaward-sloping shelves of siliciclastic margins. The structure has been compared to a bucket-stiff reef rims holding a pile of loose sediment. Remote-sensing data from the Maldive, Chagos and Laccadive archipelagos of the Indian Ocean show that ring reefs with bucket structure are the dominant depositional pattern from patch reefs of tens of meters to archipelagos of hundreds of kilometers in diameter, that is, over more than 4 orders of magnitude in linear size. Over 2.5 orders of magnitude, the bucket structures qualify as statistical fractals, exhibiting self-similar patterns and size distributions following power laws. However, most regional or genetic subsets of the data follow lognormal distributions and small subsets of lagoon reefs exhibit exponential distributions. Seismic data and boreholes in the Maldives indicate that the bucket has been a dominant depositional motif since the Oligocene. Ecological and hydrodynamic studies on modern reefs suggest that the bucket structure is a form of biotic self-organization: the edge position in a reef is favored over the center position because bottom shear is higher and the diffusive boundary layer between reef and water thinner. Thus, the reef edge has easier access to nutrients and is less likely to be buried by sediment. The bucket structure reflects these conditions. Karst processes have accentuated the surface relief of the buckets, particularly in the late Quaternary. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885913190&doi=10.1007%2fs00531-013-0913-5&partnerID=40&md5=56d4ad14e135dbf806663cce36bdb1d9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70497
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: VU University Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, Netherlands; National Coral Reef Institute, Nova Southeastern University, 8000 N Ocean Drive, Dania, FL, 33004, United States
Recommended Citation:
Schlager W.,Purkis S.J.. Bucket structure in carbonate accumulations of the Maldive, Chagos and Laccadive archipelagos[J]. International Journal of Earth Sciences,2013-01-01,102(8)