Arid
DOI10.1111/j.1365-3091.2009.01115.x
Increased terrigenous influx but no drowning: palaeoenvironmental evolution of the Tunisian carbonate platform margin during the Late Aptian
Heldt, M.1; Lehmann, J.1; Bachmann, M.1; Negra, H.2; Kuss, J.1
通讯作者Heldt, M.
来源期刊SEDIMENTOLOGY
ISSN0037-0746
EISSN1365-3091
出版年2010
卷号57期号:2页码:695-719
英文摘要

During the Aptian, some carbonate platforms of the sub-tropical realm (for example, on the northern Tethys margin or in the Gulf of Mexico) were affected repeatedly by severe perturbations in the carbonate production factory and drowning, preferentially during global warming events such as the Early Aptian Oceanic Anoxic Event 1a and a prominent mid-Late Aptian warming interval. These platform growth crises have been explained mainly by strongly increased coastal runoff (for example, siliciclastics and nutrients) in combination with pronounced eustatic sea-level rises. In the last few years, increasing evidence suggests that carbonate platforms of lower latitudes were generally less or even not affected by environmental perturbations during these events. This raises the question as to the responsible factors that promoted platform growth or decline in different latitudinal areas. In this study, Upper Aptian (Middle Gargasian to Uppermost Clansayesian) inner-tropical carbonate ramp deposits of the Serdj Formation at Djebel Serdj, north-central Tunisia are studied in detail with regard to microfacies, lithology, biostratigraphy and chemostratigraphy. These data allow reconstruction of the palaeoenvironmental evolution of the Tunisian carbonate platform margin and investigation of its response to the prominent mid-Late Aptian warming interval. The unusually expanded, 600 m thick Serdj Formation consists of limestones, marlstones and siltstones, suggesting deposition within mid-ramp to inner-ramp palaeoenvironments. Deposits of the mid-Late Aptian are represented by quartz-rich platform carbonates and siltstones, probably resulting from increased coastal runoff on the Tunisian shelf as a response to global warming and accelerated water cycling. The siliciclastic input was accompanied by elevated nutrient levels as indicated by a partial decline in the abundance of oligotrophic biota and mass occurrences of orbitolines and green algae. Carbonate platform drowning during the mid-Late Aptian, as reported from the sub-tropical realm, has not been identified. A comparison with other tropical river-influenced platforms suggests that none of them drowned during the mid-Late Aptian. One important reason might be widespread arid to semi-arid climatic conditions within lower latitudes during that time, promoting platform growth due to comparably low nutrient runoff.


英文关键词Aptian biostratigraphy carbonate platform chemostratigraphy global climate change microfacies
类型Review
语种英语
国家Germany ; Tunisia
收录类别SCI-E
WOS记录号WOS:000273669500018
WOS关键词SHALLOW-WATER CARBONATES ; EARLY CRETACEOUS CARBON ; ISOTOPE STRATIGRAPHY ; DEPOSITIONAL SEQUENCES ; SE FRANCE ; PATTERNS ; RECORD ; PALEOCEANOGRAPHY ; BIOSTRATIGRAPHY ; SUCCESSIONS
WOS类目Geology
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/166385
作者单位1.Univ Bremen, FB Geosci 5, D-28334 Bremen, Germany;
2.Univ Tunis, Dept Geosci, Tunis 2092, Tunisia
推荐引用方式
GB/T 7714
Heldt, M.,Lehmann, J.,Bachmann, M.,et al. Increased terrigenous influx but no drowning: palaeoenvironmental evolution of the Tunisian carbonate platform margin during the Late Aptian[J],2010,57(2):695-719.
APA Heldt, M.,Lehmann, J.,Bachmann, M.,Negra, H.,&Kuss, J..(2010).Increased terrigenous influx but no drowning: palaeoenvironmental evolution of the Tunisian carbonate platform margin during the Late Aptian.SEDIMENTOLOGY,57(2),695-719.
MLA Heldt, M.,et al."Increased terrigenous influx but no drowning: palaeoenvironmental evolution of the Tunisian carbonate platform margin during the Late Aptian".SEDIMENTOLOGY 57.2(2010):695-719.
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