Palaeovegetation variation in response to the late Oligocene-early Miocene East Asian summer monsoon in the Ying-Qiong Basin, South China Sea

Ding, Wenjing; Hou, Dujie; Gan, Jun; Wu, Piao; Zhang, Mengting; George, Simon C.

doi:10.1016/j.palaeo.2020.110205

Cited by 25 publications

(15 citation statements)

References 103 publications

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“…Our results suggest that strong seasonality of rainfall in southern China may have been a feature of a late Oligocene EAM system. This interpretation broadly agrees with the prevailing model of a weak EAM beginning in the Eocene (Licht et al, 2014;Quan et al, 2012;Xie et al, 2019Xie et al, , 2020 and gradually transitioning to a monsoon system at least as strong as today during the Miocene (Ding et al, 2021;Sun & Wang, 2005;Tada et al, 2016). The paleoclimate estimates we report help to fill a substantial data gap from the late Oligocene in southern and eastern China compared to the Eocene and Miocene (Guo et al, 2008;Sun & Wang, 2005;Tada et al, 2016).…”

Section: Implications For Eam Evolutionsupporting

confidence: 89%

Late Oligocene Precipitation Seasonality in East Asia Based on δ¹³C Profiles in Fossil Wood

Vornlocher

Lukens

Schubert

et al. 2021

Paleoceanog and Paleoclimatol

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The Cenozoic evolution of Asian monsoon systems remains a rich topic of debate and active, interdisciplinary investigation. Paleoclimate proxies and simulations suggest that highly seasonal precipitation existed across southern Asia in the Eocene, likely driven by migrations of the Inter-Tropical Convergence Zone similar to the modern South Asian Monsoon or Indonesian-Australian Monsoon systems (Farnsworth et al.

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Section: Implications For Eam Evolutionsupporting

confidence: 89%

Late Oligocene Precipitation Seasonality in East Asia Based on δ¹³C Profiles in Fossil Wood

Vornlocher

Lukens

Schubert

et al. 2021

Paleoceanog and Paleoclimatol

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“…Palaeovegetational and palaeoclimatic reconstructions have recently suggested that the East Asian summer monsoon (EASM) started to establish about 24.9 Ma [56]. Additionally, the strength of the South Asian summer monsoon (SASM) increased at 24-23 Ma [22].…”

Section: Discussion and Conclusion (A) Immigration Into The Subtropical Southeast Asian Karstsmentioning

confidence: 99%

Immigration dynamics of tropical and subtropical Southeast Asian limestone karst floras

Xiang

Zhang

et al. 2022

Proc. R. Soc. B.

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Ex situ origins and dispersal of taxa have played important roles in the assembly of island-like biodiversity hotspots. Insular limestone karsts in Southeast Asia are hotspots of biodiversity and endemism, but the immigration processes of their unique floras are still poorly known. Here, we used Gesneriaceae as a proxy to investigate the immigration dynamics of tropical and subtropical Southeast Asian karst floras. We present the most comprehensive phylogenetic analysis of the Old World gesneriads to date based on twelve loci. By estimating divergence times and reconstructing ancestral states (habitat, soil type and range), we found that immigration into subtropical Southeast Asian karst floras first occurred in the Early Miocene, with two peaks in the Early–Middle Miocene and the Pliocene–Early Pleistocene, whereas immigration into tropical Southeast Asian karsts initiated in the Late Eocene, with two peaks in the Late Oligocene and the Late Miocene. We also discover that Southeast Asian karst biodiversity comprises immigrant pre-adapted lineages and descendants from local acid soil ancestors, although niche shift from acid soil to karst in tropical Southeast Asian islands was lacking. This study advances our understanding of the historical assembly of Southeast Asian karst floras.

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“…The TOC was measured based on the standard process (SY/T 5116-1997) using LECO CS-230. The pyrolysis analysis was conducted on the Rock-Eval instrument, 12 and the parameters including the free hydrocarbon ( S 1 ), potential hydrocarbon ( S 2 ), and maximum temperature of hydrocarbon generation ( T max ) were obtained.…”

Section: Methodsmentioning

confidence: 99%

“…The stable carbon isotope (δ 13 C) analysis of whole oils and source rock kerogens was carried out using a Finnigan MAT-251 mass spectrometer as describe by Cai et al 14 Stable carbon isotope measurements were made on the aliphatic and the aromatic hydrocarbon fractions of oil samples as well. The 13 C/ 12 C isotope ratio of the CO 2 generated from a sample was compared with the corresponding ratio of a reference, calibrated against the PDB standard. The reproducibility of the total analytical procedure is in the range of 0.1−0.2‰.…”

Section: Methodsmentioning

confidence: 99%

Geochemical Characteristics of Three Oil Families and Their Possible Source Rocks in the Sub-Sag A of Weixinan Depression, Beibuwan Basin, Offshore South China Sea

Lin

Hou

et al. 2022

ACS Omega

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Three oil families from the sub-sag A of the Weixinan Depression are identified by integrated analysis of physical properties, stable carbon isotopes, and gas chromatography–mass spectrometry (GC–MS). Their similarities and differences in relative thermal maturities, depositional environments, and biological sources of organic matter (OM) are investigated. A possible oil–source correlation of this area is established. Group A1 oils, defined as low-maturity oils, are characterized by high density and high viscosity. They contain more terrigenous OM deposited in a freshwater environment with unstratified water columns reflected by a relatively high terrestrial/aquatic ratio and Pr/Ph values, low abundance of C 30 4-methlysteranes, and low δ 13 C values. They are derived from the upper hydrocarbon supply combination. Group A2 oils are characterized by moderate density and viscosity and medium stable carbon isotope values. This group of oils has lower terrestrial/aquatic ratios and Pr/Ph values and a medium concentration of C 30 4-methlysteranes and δ 13 C values, suggesting that the oils are derived from the shales which have more contribution from the algal input and are formed in a weakly oxidizing environment. They are a mixture generated from the source rocks in the middle and lower hydrocarbon supply combination. Groups A3 oils, defined as light oils, have low density and viscosity. The geochemical data of the A3 oils, including a less-negative stable carbon isotope, high abundance of C 30 4-methylsteranes, low Pr/Ph values, and highest Ts/(Ts + Tm) ratios (Ts represents C 27 18α(H)-22,29,30-trisnorneohopane and Tm represents C 27 17α(H)-22,29,30-trisnorhopane), suggest that they are generated from the source rocks deposited in a subanoxic environment with the large input of dinoflagellates. The A3 oils are generated from the shales from the lower hydrocarbon supply combination. The oil–source correlation results can be further supported by the distribution of faults and structural ridge as the migration channel of petroleum developed around the sub-sag A.

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Palaeovegetation variation in response to the late Oligocene-early Miocene East Asian summer monsoon in the Ying-Qiong Basin, South China Sea

Cited by 25 publications

References 103 publications

Late Oligocene Precipitation Seasonality in East Asia Based on δ¹³C Profiles in Fossil Wood

Late Oligocene Precipitation Seasonality in East Asia Based on δ¹³C Profiles in Fossil Wood

Immigration dynamics of tropical and subtropical Southeast Asian limestone karst floras

Geochemical Characteristics of Three Oil Families and Their Possible Source Rocks in the Sub-Sag A of Weixinan Depression, Beibuwan Basin, Offshore South China Sea

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Palaeovegetation variation in response to the late Oligocene-early Miocene East Asian summer monsoon in the Ying-Qiong Basin, South China Sea

Cited by 25 publications

References 103 publications

Late Oligocene Precipitation Seasonality in East Asia Based on δ13C Profiles in Fossil Wood

Late Oligocene Precipitation Seasonality in East Asia Based on δ13C Profiles in Fossil Wood

Immigration dynamics of tropical and subtropical Southeast Asian limestone karst floras

Geochemical Characteristics of Three Oil Families and Their Possible Source Rocks in the Sub-Sag A of Weixinan Depression, Beibuwan Basin, Offshore South China Sea

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Late Oligocene Precipitation Seasonality in East Asia Based on δ¹³C Profiles in Fossil Wood

Late Oligocene Precipitation Seasonality in East Asia Based on δ¹³C Profiles in Fossil Wood