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- Publisher Website: 10.1016/j.palaeo.2021.110384
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Article: Evolution of the Miocene megalake in the western Qaidam Basin, northwestern China
Title | Evolution of the Miocene megalake in the western Qaidam Basin, northwestern China |
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Authors | |
Keywords | Hydrological changes Paleolake Tibetan Plateau Biomarkers |
Issue Date | 2021 |
Publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/palaeo |
Citation | Palaeogeography, Palaeoclimatology, Palaeoecology, 2021, v. 571, p. article no. 110384 How to Cite? |
Abstract | Thick Miocene lacustrine deposits have been identified across the Qaidam Basin on the northeast Tibetan Plateau, indicative of a relatively unified megalake then. How this megalake evolved at its final stage and associated controlling factors, e.g., global climate or tectonic uplift, remain largely elusive. Here we use the KC-1 well, drilled at the depo-center of the western Qaidam Basin, to investigate the megalake evolution over the mid- and late Miocene. A set of lipid biomarker indices, namely β-carotane/n-C36, gammacerane index, terrigenous/aquatic ratio and long-chain saturated ketone content, altogether indicate substantial lake level fluctuations, with lower lake level at the intervals of ~18–17 Ma, 13.5–11.5 Ma, 10.5–8 Ma and 7–6 Ma, and higher level at the intervals of ~17–13.5 Ma, 11.5–10.5 Ma, 8–7 Ma and 6–5 Ma, superimposed on the long-term shrinking trend. Direct comparison with existing regional and global temperature records suggests that such lake dynamics was largely associated with global climatic conditions, i.e., shrinking under relatively cool conditions and vice versa, for both its long-term evolution and secondary fluctuations. It thus appears that global climatic conditions had controlled the megalake status during the mid- and late Miocene, whereas tectonic activities then might have also contributed to its long-term gradual demise. |
Persistent Identifier | http://hdl.handle.net/10722/304672 |
ISSN | 2023 Impact Factor: 2.6 2023 SCImago Journal Rankings: 0.994 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | LIANG, Y | - |
dc.contributor.author | Zhang, B | - |
dc.contributor.author | Zhang, Y | - |
dc.contributor.author | Zhang, Y | - |
dc.contributor.author | Wang, J | - |
dc.contributor.author | Liu, Z | - |
dc.date.accessioned | 2021-10-05T02:33:30Z | - |
dc.date.available | 2021-10-05T02:33:30Z | - |
dc.date.issued | 2021 | - |
dc.identifier.citation | Palaeogeography, Palaeoclimatology, Palaeoecology, 2021, v. 571, p. article no. 110384 | - |
dc.identifier.issn | 0031-0182 | - |
dc.identifier.uri | http://hdl.handle.net/10722/304672 | - |
dc.description.abstract | Thick Miocene lacustrine deposits have been identified across the Qaidam Basin on the northeast Tibetan Plateau, indicative of a relatively unified megalake then. How this megalake evolved at its final stage and associated controlling factors, e.g., global climate or tectonic uplift, remain largely elusive. Here we use the KC-1 well, drilled at the depo-center of the western Qaidam Basin, to investigate the megalake evolution over the mid- and late Miocene. A set of lipid biomarker indices, namely β-carotane/n-C36, gammacerane index, terrigenous/aquatic ratio and long-chain saturated ketone content, altogether indicate substantial lake level fluctuations, with lower lake level at the intervals of ~18–17 Ma, 13.5–11.5 Ma, 10.5–8 Ma and 7–6 Ma, and higher level at the intervals of ~17–13.5 Ma, 11.5–10.5 Ma, 8–7 Ma and 6–5 Ma, superimposed on the long-term shrinking trend. Direct comparison with existing regional and global temperature records suggests that such lake dynamics was largely associated with global climatic conditions, i.e., shrinking under relatively cool conditions and vice versa, for both its long-term evolution and secondary fluctuations. It thus appears that global climatic conditions had controlled the megalake status during the mid- and late Miocene, whereas tectonic activities then might have also contributed to its long-term gradual demise. | - |
dc.language | eng | - |
dc.publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/palaeo | - |
dc.relation.ispartof | Palaeogeography, Palaeoclimatology, Palaeoecology | - |
dc.subject | Hydrological changes | - |
dc.subject | Paleolake | - |
dc.subject | Tibetan Plateau | - |
dc.subject | Biomarkers | - |
dc.title | Evolution of the Miocene megalake in the western Qaidam Basin, northwestern China | - |
dc.type | Article | - |
dc.identifier.email | Liu, Z: zhliu@hku.hk | - |
dc.identifier.authority | Liu, Z=rp00750 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.palaeo.2021.110384 | - |
dc.identifier.scopus | eid_2-s2.0-85103411360 | - |
dc.identifier.hkuros | 326260 | - |
dc.identifier.volume | 571 | - |
dc.identifier.spage | article no. 110384 | - |
dc.identifier.epage | article no. 110384 | - |
dc.identifier.isi | WOS:000643685200016 | - |
dc.publisher.place | Netherlands | - |