A refined foraminiferal biostratigraphy for the Late Campanian–Early Maastrichtian succession of northeast Iraq

Geoarabia Pub Date : 2014-01-01 DOI:10.2113/geoarabia1901161
R. Jaff, M. Williams, I. Wilkinson, F. Lawa, Sarah Lee, J. Zalasiewicz
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引用次数: 25

Abstract

Species of the benthonic foraminiferal genus Bolivinoides provide a refined biostratigraphic biozonation for the Late Campanian to Early Maastrichtian (Late Cretaceous) Shiranish Formation in NE Iraq. Three biozones and two subzones are identified: the Bolivinoides decoratus Biozone (Late Campanian) subdivided into a lower B. decoratus Subzone and upper B. laevigatus Subzone; the B. miliaris Biozone (Earliest Maastrichtian); and the B. draco Biozone (late Early Maastrichtian). These zones can be related to the biostratigraphical interval of the Globotruncana aegyptiaca (Late Campanian), Gansserina gansseri (latest Campanian–Early Maastrichtian) and Contusotruncana contusa (late Early Maastrichtian) planktonic foraminiferal biozones. Combined, the benthonic and planktonic foraminiferal biostratigraphy enables the informal recognition of lower and upper intervals within both the Globotruncana aegyptiaca and Gansserina gansseri biozones that may be important for more refined inter-regional correlation in the Middle East and North Africa. The new Bolivinoides biozonation precisely locates the Campanian–Maastrichtian boundary in NE Iraq. The foraminiferal assemblages also constrain the timing of a shallowing marine trend in the Shiranish Formation beginning from the latest Campanian that is consistent with shallowing facies noted globally at this time.
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伊拉克东北部坎帕尼亚晚期-马斯特里赫特早期演替的精细有孔虫生物地层
底栖有孔虫属Bolivinoides为伊拉克东北部晚坎帕世至早马斯垂纪Shiranish组(晚白垩世)提供了精细的生物地层生物分带。鉴定出3个生物带和2个亚带:晚坎帕世的decoratus Bolivinoides生物带分为decoratus下层亚带和laevigatus上层亚带;马斯特里赫特最早的B. miliaris Biozone;B. drago生物带(马斯特里赫特早期晚期)。这些带可能与Globotruncana aegyptiaca(晚坎帕世)、Gansserina gansseri(晚坎帕世-早马斯垂世)和Contusotruncana contusa(晚马斯垂世)浮游有孔虫生物带的生物地层间隔有关。结合底栖和浮游有孔虫生物地层学,可以在Globotruncana aegyptiaca和Gansserina gansseri生物带中非正式地识别下部和上部间隔,这可能对中东和北非更精确的区域间对比很重要。在伊拉克东北部的坎帕尼亚-马斯特里赫特边界精确定位了新的玻利维亚属生物带。有孔虫组合也限制了Shiranish组从最新坎帕纪开始的浅海趋势的时间,这与当时全球范围内的浅海相一致。
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来源期刊
Geoarabia
Geoarabia 地学-地球科学综合
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>12 weeks
期刊介绍: Cessation. Published from 1996 to 2015, GeoArabia, The Journal of the Middle Eastern Geosciences was a quarterly journal covering the petroleum geosciences in the Middle East. The journal covers subjects such as: - sedimentology - tectonics - geophysics - petroleum reservoir characterization
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