caa a22 4500 606150234 CHVBK 20210128100538.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s00531-014-1089-3 doi (NATIONALLICENCE)springer-10.1007/s00531-014-1089-3 Organic accumulation in lacustrine rift basin: constraints from mineralogical and multiple geochemical proxies [Elektronische Daten] [Xiugen Fu, Wang Jian, Wenbin Chen, Xinglei Feng, Dong Wang, Chunyan Song, Shengqiang Zeng] The Lunpola Basin in the central Tibet is the highest petroliferous basin in the world. The basin is a Cenozoic lacustrine rift basin with widespread oil shale depositions, which provide a valuable example for understanding the mechanisms of organic accumulation. Thirty-five samples of oil shale and mudstone were collected from one of the organic-rich oil shale intervals in the Lunpola Basin to discuss the controlling factors of organic enrichment. In the investigated oil shale interval, many redox proxies, including V/(V+Ni) ratios, Mo-U covariations, and pyrite framboid size distribution suggest anoxic conditions. However, the almost consistent variation patterns of TOC, P and Mo contents indicate that organic matter accumulation was controlled mainly by primary productivity. The relatively low Sr/Ba (average 0.74) and Sr/Cu ratios (average 4.75) suggest a warm-humid climate during the oil shale deposition. These conditions are suitable for living of organisms, which would raise the initial productivity of lake and in turn could have led to the oxygen-depleted conditions. The detrital input together with fast sedimentary rate during the oil shale deposition would result in dilution of organic matter. Springer-Verlag Berlin Heidelberg, 2014 Organic accumulation nationallicence Oxygen-depleted condition nationallicence Primary productivity nationallicence Lacustrine sediments nationallicence Lunpola Basin nationallicence Tibet nationallicence Fu Xiugen Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut Jian Wang Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut Chen Wenbin Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut Feng Xinglei Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut Wang Dong Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut Song Chunyan Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut Zeng Shengqiang Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut International Journal of Earth Sciences Springer Berlin Heidelberg 104/2(2015-03-01), 495-511 1437-3254 104:2<495 2015 104 531 https://doi.org/10.1007/s00531-014-1089-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00531-014-1089-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fu Xiugen Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut NATIONALLICENCE 700 1- Jian Wang Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut NATIONALLICENCE 700 1- Chen Wenbin Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut NATIONALLICENCE 700 1- Feng Xinglei Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut NATIONALLICENCE 700 1- Wang Dong Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut NATIONALLICENCE 700 1- Song Chunyan Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut NATIONALLICENCE 700 1- Zeng Shengqiang Chengdu Institute of Geology and Mineral Resources, 610081, Chengdu, China aut NATIONALLICENCE 773 0- International Journal of Earth Sciences Springer Berlin Heidelberg 104/2(2015-03-01), 495-511 1437-3254 104:2<495 2015 104 531