Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31432.1 |
Southeastern Tanzania depositional environments, marine and terrestrial links, and exceptional microfossil preservation in the warm Turonian | |
Haynes, Shannon J.1; MacLeod, Kenneth G.1; Huber, Brian T.2; Warny, Sophie3,4; Kaufman, Alan J.5,6; Pancost, Richard D.7,8; Berrocoso, Alvaro Jimenez9; Petrizzo, Maria Rose10; Watkins, David K.11; Zhelezinskaia, Iadviga5,6 | |
2017-05-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2017 |
卷号 | 129 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England; Italy |
英文摘要 | Sediment cores from southeastern Tanzania contain exceptionally well-preserved calcareous and organic-walled microfossils in numerous samples spanning from the Aptian to the Miocene. The unusually high quality of preservation is commonly attributed to shallow burial and high clay content of the host sediments. However, such attributes apply to many deposits that are not characterized by exceptional preservation, and, thus, invoking only grain size and burial depth is clearly an incomplete explanation for the exceptional microfossil preservation. In an attempt to better characterize additional factors that were important in creating the Tanzanian microfossil lagerstatte, we integrated a wide range of paleontological, geochemical, and sedimentological observations to constrain the paleoenvironmental and early diagenetic conditions of a Turonian interval where exceptional preservation is common. Planktic microfossil assemblages suggest that openocean surface- water conditions prevailed at the site, but, despite excellent organic matter preservation, marine biomarkers are rare. The sediments are dominantly composed of terrigenous silts and clays and terrestrially derived organic matter. Paleontological and geochemical observations record a remarkably stable interval dominated by excellent preservation through the LowerMiddle Turonian. During the Middle-Upper Turonian, though, the preservation quality declines, and this is associated with notable shifts in foraminiferal assemblages, palynological species diversity, carbon and sulfur isotope compositions, and biomarker distributions. The integrated data suggest that an increase in subsurface microbial activity and associated changes in pore-water chemistry were important proximate variables that led to the decline in the quality of micro-fossil preservation up section within these shallowly buried, Turonian silty claystones from Tanzania. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000403309300001 |
WOS关键词 | CAMPANIAN PLANKTONIC-FORAMINIFERA ; SULFATE REDUCTION ; CALCAREOUS NANNOFOSSILS ; SECULAR VARIATION ; ALBIAN-CONIACIAN ; COASTAL TANZANIA ; EXMOUTH PLATEAU ; ORGANIC-CARBON ; SEDIMENTS ; SULFUR |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24594 |
专题 | 地球科学 |
作者单位 | 1.Univ Missouri, Dept Geol Sci, 101 Geol Bldg, Columbia, MO 65211 USA; 2.Smithsonian Museum Nat Hist, Dept Paleobiol, MRC 121, Washington, DC 20013 USA; 3.Louisiana State Univ, Dept Geol & Geophys, E235 Howe Russell, Baton Rouge, LA 70820 USA; 4.Louisiana State Univ, Museum Nat Sci, E235 Howe Russell, Baton Rouge, LA 70820 USA; 5.Univ Maryland, Dept Geol, College Pk, MD 20742 USA; 6.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA; 7.Univ Bristol, Cabot Inst, Sch Chem, Organ Geochem Unit, Bristol BS8 1TS, Avon, England; 8.Univ Bristol, Cabot Inst, Bristol BS8 1UJ, Avon, England; 9.Repsol Serv Co, 2455 Technol Forest Blvd,Bldg 5, The Woodlands, TX 77381 USA; 10.Univ Milan, Dipartimento Sci Terra Ardito Desio, Via Mangiagalli 34, I-20133 Milan, Italy; 11.Univ Nebraska, Dept Earth & Atmospher Sci, Lincoln, NE 68588 USA |
推荐引用方式 GB/T 7714 | Haynes, Shannon J.,MacLeod, Kenneth G.,Huber, Brian T.,et al. Southeastern Tanzania depositional environments, marine and terrestrial links, and exceptional microfossil preservation in the warm Turonian[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | Haynes, Shannon J..,MacLeod, Kenneth G..,Huber, Brian T..,Warny, Sophie.,Kaufman, Alan J..,...&Zhelezinskaia, Iadviga.(2017).Southeastern Tanzania depositional environments, marine and terrestrial links, and exceptional microfossil preservation in the warm Turonian.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | Haynes, Shannon J.,et al."Southeastern Tanzania depositional environments, marine and terrestrial links, and exceptional microfossil preservation in the warm Turonian".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
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