气候变化领域集成服务门户(CCPortal): Microfacies; biofacies; and depositional environments of the Bajocian–Bathonian Middle Dhruma carbonates; central Saudi Arabia

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DOI	10.1007/s00531-019-01778-8
	Microfacies; biofacies; and depositional environments of the Bajocian–Bathonian Middle Dhruma carbonates; central Saudi Arabia
	Ismanto A.W.; Chan S.A.; Babalola L.O.; Kaminski M.A.; Al-Ramadan K.A.; Abdullatif O.M.
发表日期	2019
ISSN	14373254
起始页码	2577
结束页码	2601
卷号	108 期号:8
英文摘要	Three cliff-forming outcrops of the Dhruma Formation representing the carbonate platform in the Hafirat Nisha district west of Riyadh, Saudi Arabia, were investigated to identify and understand the microfacies variability in a carbonate ramp setting. An integrated approach including detailed field investigations, petrographic, biofacies, and micropaleontological analyses was used to construct a model of the depositional environments of the investigated outcrop sections. The depositional model indicates that the identified lithofacies were predominantly deposited in outer ramp, middle ramp, inner ramp, and lagoonal settings. The presence of the benthic foraminifera Redmondoides lugeoni and Nautiloculina oolithica and the trace fossil Thalassinoides indicates deposition in shallow-water environments and the prevalence of warm climatic conditions during the Middle Jurassic. The occurrences of calcareous and agglutinated benthic foraminiferal species Pseudomarssonella maxima, Siphovalvulina variabilis, Timidonella sarda, N. oolithica, R. lugeoni, Praekurnubia crusei, Paleopfenderina salernitana, Haurania deserta, Siphovalvulina spp., Lenticulina sp., Textulariopsis sp., and Amijella amiji imply that our studied sections are situated within the Dm-2 to Dm-5 biozones (Bajocian to early Bathonian). This is also supported by the calcareous nannofossil assemblages that show a Bajocian to early Bathonian age. The depositional sequences indicate a shift in the depositional environment from low-energy lagoonal with intermittent shoal complexes in the D2 and D3 Units to predominantly shoal complex and open-marine settings in the D4 Unit, suggesting a seaward shift towards the top of the D4 Unit. The interpreted depositional settings are similar to those previously documented in the subsurface equivalent, Faridah reservoir. This indicates that the investigated D2–D4 Units outcrops are excellent analogues of the subsurface reservoir. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Dhruma formation; Microfacies; Middle Jurassic; Paleoenvironment; Saudi Arabia
语种	英语
scopus关键词	Bajocian; Bathonian; biofacies; carbonate platform; carbonate sediment; depositional environment; Jurassic; microfacies; paleoenvironment; Saudi Arabia; Foraminifera; Lenticulina; Sarda; Thalassinoides
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147766
作者单位	Geosciences Department, College of Petroleum Engineering and Geosciences, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia; Centre for Integrative Petroleum Research, College of Petroleum Engineering and Geosciences, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia
推荐引用方式 GB/T 7714	Ismanto A.W.,Chan S.A.,Babalola L.O.,等. Microfacies; biofacies; and depositional environments of the Bajocian–Bathonian Middle Dhruma carbonates; central Saudi Arabia[J],2019,108(8).
APA	Ismanto A.W.,Chan S.A.,Babalola L.O.,Kaminski M.A.,Al-Ramadan K.A.,&Abdullatif O.M..(2019).Microfacies; biofacies; and depositional environments of the Bajocian–Bathonian Middle Dhruma carbonates; central Saudi Arabia.International Journal of Earth Sciences,108(8).
MLA	Ismanto A.W.,et al."Microfacies; biofacies; and depositional environments of the Bajocian–Bathonian Middle Dhruma carbonates; central Saudi Arabia".International Journal of Earth Sciences 108.8(2019).