Abstract：In the North German Basin,outcrops consisting of the upper Jurassic deposits are widely spread throughout the basin. However,most of them only cover part of the upper Jurassic succession. The drilled Eulenflucht 1 and Wendhausen 6 cores,located in the Süntel and Hildesheimer Wald,respectively,consisting of the Oxfordian and Kimmeridgian deposits,provide valuable data for analyzing the upper Jurassic depositional history and the palaeoclimate variations in North German Basin. Via core description and microscopic observation,14 rock types are identified based on their distinctive grain compositions,fossil associations,and sedimentary texture and structures. They are interpreted to be formed either in carbonate ramp or deltaic environment. A sedimentary succession of the Oxfordian and Kimmeridgian deposits is established showing facies variations. From the Heersum to Süntel Formation,the sedimentary environment changes from outer shelf,inner shelf,and shoreface to open platform restricted lagoon,and tide flat,showing a trend of relative sea-level fall. Mg/Ca values of the well-preserved oyster shells composed of low-magnesium calcite are measured to reflect the palaeoclimate changes. Generally,it shows a warming trend from the Oxfordian to Kimmeridgian,among which three warm intervals are distinguished. These signals of palaeoclimate variations are not only consistent with the palaeoclimate changes obtained from facies analysis,but also comparable with the palaeotemperature fluctuations in Scotland and Russian Platform,suggesting that(1)palaeoclimate change played a controlling role during the upper Jurassic sedimentary evolution in the North German Basin,and(2)the Mg/Ca values of oyster shells can be used as a valid palaeoclimate proxy for analyzing palaeoclimate in other areas.
Bai Hua-Qing,Kuang Hong-Wei,Liu Yong-Qing et al. Sedimentary environments and palaeoclimate of the upper Jurassic deposits in the North German Basin[J]. JOPC, 2021, 23(2): 405-420.
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