δ18O, δ13C, elemental content and depositional features of a stalagmite from Yelang Cave reflecting climate and vegetation changes since late Pleistocene in central Guizhou, China

Zhao, Min; Li, Hongchun; Shen, Chuan‐Chou; Kang, Su-Chen; Chou, Cheng‐Ying

doi:10.1016/j.quaint.2016.07.022

Cited by 13 publications

(5 citation statements)

References 59 publications

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“…Thus, δ 13 C values in KM-1 refer to changes in vegetation cover, density and primary vegetation sources related to monsoon intensity that varied during this period and serves as a simple analog. Notably, there is a very high correlation between δ 18 O and δ 13 C values (R 2 = 0.75, p < 0.05), which implies an overlapping climatic control on the isotopic signals similar to other studies 21 , 22 .…”

Section: Resultssupporting

confidence: 84%

“…Hence, organic matter preserved in speleothems could reveal changes in δ 13 C values spanning the glacial-interglacial cycles and vegetation cover. In particular, the covariance noted between δ 13 C with δ 18 O signals in speleothems indicates climate driven vegetation changes, and increase in the vegetation cover is reflected as depleted δ 13 C and δ 18 O values in speleothems 22 . In this context, the role of microbial input to soil organic matter 23 affecting the vegetation signal preserved in δ 13 C of the speleothem should be comparatively minimal in caves covered with thin soil cover.…”

Section: Combining Proxy Records In Stalagmitesmentioning

confidence: 97%

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Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics

Huguet

Routh

Fietz

et al. 2018

Sci Rep

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High-resolution paleoclimate data on stable isotopes in a stalagmite were coupled to glycerol dialkyl glycerol tetraethers (GDGTs). The Indian Summer Monsoon (ISM) transitioned from limited rainfall during the Last Glacial Maximum (LGM) to intense precipitation during early Holocene (22 to 6 ka). This was associated with changes in stalagmite growth, abundance of branched (br) and isoprenoid (iso) GDGTs, as well as δ18O, δ13C, Sr/Ca and GDGT-derived signals providing both temperature and moisture information. The reconstructed mean annual air temperature (MAAT) of the most modern stalagmite sample at ~19 °C, matches the surface and cave MAAT, but was ~4 °C lower during LGM. Warming at the end of LGM occurred before ISM strengthened and indicate 6 ka lag consistent with sea surface temperature records. The isotope records during the Younger Dryas show rapid progressions to dry conditions and weak monsoons, but these shifts are not coupled to TEX86. Moreover, change to wetter and stronger ISM, along with warmer Holocene conditions are not continuous indicating a decoupling of local temperatures from ISM.

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Section: Resultssupporting

confidence: 84%

Section: Combining Proxy Records In Stalagmitesmentioning

confidence: 97%

Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics

Huguet

Routh

Fietz

et al. 2018

Sci Rep

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“…This is the fundamental concept of 210 Pb dating. Since the subsample of the core was not enough for our gamma spectrometry, 210 Po alpha method was used for the 210 Pb dating (Baskaran and Iliffe, 1993;Baskaran and Krishnamurthy, 1993;Li et al, 1996;Paulsen et al, 2003;Li et al, 2011;Kuo et al, 2011;Yin et al, 2014;Zhao et al, 2015;Yin et al, 2017;Zhao et al, 2017a;Yin et al, 2019). As a daughter product of 210 Pb decay, 210 Po has a half-life of 138.38 days.…”

Section: Pb Datingmentioning

confidence: 99%

Interannual Variations of D14CTOC and Elemental Contents in the Laminated Sediments of the Santa Barbara Basin During the Past 200 Years

Chang

Berelson

et al. 2022

Front. Mar. Sci.

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A 51-cm core (SBB-8-2012) from the depo-center of Santa Barbara Basin (SBB), California has been dated by 210Pb dating and varve counting, spanning a depositional history during 1815-2011 CE. A total of 89 AMS 14C measurements on samples from 66 horizons, including animal cartilage, shell and total organic carbon (TOC) in the sediments show apparent 14C ages between 500 and 4000 yr BP. Among these AMS dates, D14C values measured in 78 samples from 62 horizons vary in the range of -64.3‰ to -383.8‰. The 14CTOC ages much older than predicted from our sedimentation model are influenced by the input of terrigenous sediments, changes in ocean circulation, biological input and carbon remineralization. Three strong old 14CTOC excursions at 1964~69, 1884~87 and 1819~21 CE indicate higher old carbon input caused by some unusual events (e.g., oil spill, flood event and earthquake). On multi-decadal timescales, the D14CTOC shifts in three zones were mainly caused by changes in fossil carbon emission from the seafloor, fraction of marine productivity to terrigenous input of organic carbon (OC) and the atmospheric nuclear bomb testing input of 14C into the SBB. On interannual to decadal timescales, variations of D14CTOC correspond to El Niño-Southern Oscillation effects. During the La Niña period, stronger upwelling and northerly California Current bring nutrient-enriched water into SBB and lead to higher productivity hence more marine OC with higher D14CTOC. In addition, reduced terrigenous input of OC with lower D14C under less coastal rainfall during La Niña could further elevate the D14CTOC. Lower scanning XRF (K+Ti)/2 (indicating lower terrigenous input), higher scanning XRF Sr/Ti as well as acid-leachable elements (reflecting higher biogenic components), and higher D14CTOC occur during La Niña. During the El Niño period, the phenomena are opposite. Spectrum analyses of the Southern Oscillation Index (SOI) and the D14CTOC as well as the comparison of SOI and SBB-8-2012 records support our scenarios.

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“…Oxygen isotope ratios in stalagmites from caves in Socotre Island, Indian Ocean (Burns et al, 2003), suggested that the changes in monsoon precipitation and climate from 42,000 to 55,000 yr BP are linked to varying intensities of tropical convective activity in tropical hydrological cycles in the Indian Ocean and over Southeast Asia. The stalagmites from Yelang Cave, central Guizhou, China (Zhao et al, 2017) showed that from 33,400 to 36,000 yr BP, the area was dry very cold and dry climates with poor vegetation and warming and very wet climates with the best vegetation coverage during 9,000-11,500 yr BP corresponding to a maximum insolation.…”

Section: Palaeoclimatementioning

confidence: 99%

Micromorphology, mineralogy, and geo-chemistry of sediments at the Tham Lod rock shelter archaeological site in Mae Hong Son, Thailand: suggestions of a late Pleistocene climate

Saminpanya¹,

Denkitkul²

2020

JCKS

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Sediments from an archaeological pit at the Tham Lod rock shelter in Mae Hong Son, Thailand, reveal sparse palaeoenvironment and palaeoclimate information in the northwestern region of Thailand and Southeast Asia. This study is a pioneering work for the site. Micromorphological, mineralogical, and geochemical methods were applied for analyses. The sediment profile was divided into two zones: the upper 0-338 cm depth and the lower 338-450 cm depth. Intense chemical weathering occurred in the lower zone, indicated by low quantities of kaolinite and high chemical index of alteration (CIA, 64.55-73.36%), reflecting greater humidity. The upper zone yielded mild CIA (47.21%) and contained ubiquitous smectite, indicating drier conditions. Overall sediments (along the profile, 0-450 cm depth) were affected by leaching and thin section analyses suggested a wet/dry cycle during diagenesis under humid tropical conditions. Micromorphological and geochemical analyses indicated that mudstone, sandstone, and limestone were major parent materials of sediments deposited mainly in a fluvial environment in the lower zone, which changed to a colluvial environment in the upper zone. The palaeoclimate during 12,770-33,340 yr BP was in the Last Glacial Maximum Period, characterized by drier and cooler than the present climate. The period 33,340 yr BP was wet and cool. Evidence of prehistoric human occupation, including bone and charcoal fragments, appeared in sediments in the upper zone, suggesting animal hunting for survival. Materials and Methods Micromorphological, mineralogical, and geochemical contexts are used in this work. Depositional sediments can record evidence or processes (Selley, 1985) that can be observed via micromorphology following the guidelines of Stoops et al. (2010). The aspect of geochemistry regarding the chemical processes of alteration, elemental signatures, and mineralogy, including clay-based minerals, can reveal the weathering intensity, sediment provenance, climatic environments, and anthropogenic input to the site. Study area The Tham Lod rock shelter site is located in the well-known archaeological pit in the Pang Mapha district in Mae Hong Son Province, Thailand. The shelter is located in a karst area at latitude 19°34′03′′ N and longitude 98°16′46′′ E, with an elevation of 640 m above mean sea level (Fig. 1). The pit is situated in a boundary of the Tham Lod Natural and Wildlife Education Center. The details of its physical characteristics have already been reported by Marwick (2013) and Chitkament et al. (2016).

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δ18O, δ13C, elemental content and depositional features of a stalagmite from Yelang Cave reflecting climate and vegetation changes since late Pleistocene in central Guizhou, China

Cited by 13 publications

References 59 publications

Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics

Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics

Interannual Variations of D14CTOC and Elemental Contents in the Laminated Sediments of the Santa Barbara Basin During the Past 200 Years

Micromorphology, mineralogy, and geo-chemistry of sediments at the Tham Lod rock shelter archaeological site in Mae Hong Son, Thailand: suggestions of a late Pleistocene climate

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