Palynology,palynofacies analysis,depositional environments and source rock potential of Lower Cretaceous successions in southern Iraq |
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| Affiliation: | 1. Department of Geology, Faculty of Science, Mansoura University, 35516 Mansoura, Egypt;2. Halliburton, Neftex Exploration Insights, 97 Jubilee Avenue, Milton Park, Abingdon, OX14 4RW, United Kingdom;3. Senckenberg Research Institute and Natural History Museum, 60325 Frankfurt am Main, Germany;4. Institute of Geology and Geochemistry of Petroleum and Coal, Energy and Mineral Resources Group (EMR), RWTH Aachen University, 52056 Aachen, Germany;1. Instituto Geológico y Minero de España (IGME), Ríos Rosas 23, E-28003 Madrid, Spain;2. Robertson (UK) Ltd., Tyn-y-Coed, Pentywyn Road, Llandudno, Gwynedd LL30 1SA, UK;3. Departamento de Estratigrafía, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, José Antonio Novais 2, E-28040 Madrid, Spain;4. Saudi Arabian Oil Company, Dhahran, Saudi Arabia;5. Museo de Ciencias Naturales de Álava, Siervas de Jesús 24, E-01001 Vitoria-Gasteiz, Spain;6. Departamento de Paleontología, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, José Antonio Novais 2, E-28040 Madrid, Spain;1. Environmental and Applied Geology Department, The University of Jordan, 11942 Amman, Jordan;2. Department of Geology, Faculty of Science, Mansoura University, 35516 Mansoura, Egypt;3. Programa de Pós-Graduação em Ambiente e Desenvolvimento da UNIVATES (PPGAD/UNIVATES), Centro Universitário Univates, Rua Avelino Tallini, 171 – CEP 95.900-000, Lajeado, RS, Brazil;4. Senckenberg Forschungsinstitut und Naturmuseum, Senckenberganlage 25, 60325 Frankfurt am Main, Germany;5. Senckenberg Centre for Human Evolution and Palaeoenvironment, Institut für Geowissenschaften, Universität Tübingen, Sigwartstraße 10, 72076 Tübingen, Germany;1. Department of Geology, Faculty of Science, Cairo University, 12613, Giza, Egypt;2. Department of Geology, Faculty of Science, Assiut University, 71516, Assiut, Egypt |
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| Abstract: | A diverse and well-preserved non-marine and marine palynomorph assemblage was recovered from the Lower Cretaceous Yamama, Ratawi and Zubair formations in southern Iraq.A distinctive monospecific assemblage of the dinocyst Subtilisphaera in the Ru-19 Well, in addition to its frequent occurrence in other wells in the Zubair Formation, reflects an ecologically stressed, marginal-marine environment. This assemblage constitutes the first record of the Subtilisphaera ecozone in Iraq and Arabian realm and indeed only the second one east of Morocco.The palynofacies composition of the studied rock units has been related to previous organic geochemical analyses. Each rock unit has its own palynofacies characteristics and in general, samples dominated by amorphous kerogen have the highest total organic carbon (TOC) and hydrogen index (HI), as is the case for some samples from the studied Yamama Formation and samples belonging to palynofacies PF2 from the Zubair Formation. Samples that are mostly retrieved from the Zubair Formation, containing abundant phyoclasts, have the lowest TOC and HI values. |
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| Keywords: | Palynology Palynofacies Organic geochemistry Cretaceous Iraq |
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