The intensity of chemical weathering: Geochemical constraints from marine detrital sediments of Triassic age in South China

Zhao, Mingyu; Zheng, Yong‐Fei

doi:10.1016/j.chemgeo.2014.11.004

Cited by 57 publications

(11 citation statements)

References 89 publications

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“…Additionally, the molar ratio of Fe/S has been used to determine relative abundance of pyrite; ratio values near 2 signify the dominance of pyrite as the Fe‐incorporating phase (Zhao & Zheng, ). A change in this ratio can signify a change in the Fe‐bearing phase (such as Fe‐hydroxide, which can be related to hydrothermal plumes).…”

Section: Results and Interpretations By Categorymentioning

confidence: 99%

Clinoform identification and correlation in fine‐grained sediments: A case study using the Triassic Montney Formation

Playter

Corlett²,

Konhauser

et al. 2017

Sedimentology

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Stratigraphic correlation of fine-grained successions is not always straightforward. Complicating factors, such as unconformities, structural complexity, subsidence and especially minimal grain-size variation, make the application of traditional correlation methods to fine-grained successions problematic. Alternatively, the analysis of detailed geochemical data can allow for the determination of variations in sediment provenance, mineralogy, detrital flux and hydrothermal input. When compared with modelled clay input over time, these geochemical indicators can be used to determine changes in relative sea-level and palaeoclimate, allowing for the identification of clinoform surfaces. As an example, this study outlines detailed correlations of chemostratigraphic packages within the lower Triassic Montney Formation in Western Canada to demonstrate the effectiveness of chemostratigraphy in defining and correlating fine-grained clinoforms across a sedimentary basin. The data set used includes five wells and one outcrop succession, from which geochemical profiles were generated and tied directly to mineralogical data and well logs. These analyses reveal 13 distinct chemostratigraphic packages that correlate across the basin. Observed elemental and inferred mineralogical changes highlight trends in relative sea-level and palaeoclimate, as well as episodes of inferred hydrothermal input to the Montney basin. Cross-plots of La/Sm and Yb/Sm further suggest hydrothermal input as well as the scavenging of middle rare earth elements by phosphatic fish debris. Additionally, plots of La/Sm versus Yb/Sm, which show volcanic arc input within the Doig Formation, suggest an additional sediment source from the west during the Anisian. Pairing detrital and clay proxies demonstrates changes in relative sea-level and, at the Smithian/Spathian boundary, the lowest relative sea-level in the Montney Formation is observed, corresponding to a change in climate.

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Section: Results and Interpretations By Categorymentioning

confidence: 99%

Clinoform identification and correlation in fine‐grained sediments: A case study using the Triassic Montney Formation

Playter

Corlett²,

Konhauser

et al. 2017

Sedimentology

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“…The intensity of weathering can be represented by some chemical element ratios in the marine sediments, such as Al/Ti, Al/K (Kronberg et al, 1986;Wei et al, 2004;Zhao and Zheng, 2015). In South China, climate is influenced significantly by the Asian monsoon, hence the chemical intensity should correspond to monsoon changes.…”

Section: Chemical Weathering Intensity and Terrigenous Fluxmentioning

confidence: 99%

“…Marine terrigenous detrital sediments record information from chemical weathering of the continental crust, which is directly related to climate (Clift, 2006;Hu et al, 2012Hu et al, , 2013Zhao and Zheng, 2015). The intensity of weathering can be represented by some chemical element ratios in the marine sediments, such as Al/Ti, Al/K (Kronberg et al, 1986;Wei et al, 2004;Zhao and Zheng, 2015).…”

Section: Chemical Weathering Intensity and Terrigenous Fluxmentioning

confidence: 99%

“…Climate has typically been regarded as the primary determinant of weathering and erosion on a glacial-interglacial time scale. Faster chemical weathering and erosion correlates with more humid, warm climates whereas weaker weathering and less erosion correlates with drier climates (Clift, 2006;Zhao and Zheng, 2015). In South China, the Asian monsoon has played an important role in the weathering process and river inputs from land to marine after the Cenozoic era.…”

Section: Introductionmentioning

confidence: 99%

“…Weathering intensity and continental erosion determine the geological progression in near-surface spaces, and these are related to tectonic uplift and climate change (Clift and Giosan, 2014;Zhao and Zheng, 2015). Most eroded terrigenous materials formed by the weathering process are eventually deposited in the oceans and these deposits reveal aspects of the weathering intensity and clastic flux sediments from rivers (Wei et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chemical Weathering Intensity and Terrigenous Flux in South China during the Last 90,000 Years—Evidence from Magnetic Signals in Marine Sediments

et al. 2016

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The level of chemical weathering is strongly affected by climate. We presented magnetic properties associated with element ratios from the northern part of the South China Sea to denote links between chemical weathering intensity and monsoon changes in the previous 90,000 years. The magnetic parameter IRM AF80mT /SIRM, representing the variations of high coercivity minerals in marine sediments accompanied with the Al 2 O 3 /TiO 2 and the Chemical Index of Alteration (CIA), demonstrates strong chemical and physical weathering processes during the last 84-40 kyr when intensified Asian monsoon and warm climate occurred. High susceptibility, TiO 2 content, and relatively coarser magnetic mineral grain (relatively low ARM/SIRM ratio) also suggest more terrigenous clastic flux resulting from intensified physical erosion and river transport ability. During the 40-15 kyr period, a low IRM AF80mT /SIRM as well as chemical proxies indicate weak weathering as the climate cooled and precipitation decreased.

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Hydroclimate variability during the last two millennia from the mudflats of Diu Island, Western India

et al. 2021

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The climate variability over western India has been significantly influenced by the perturbations in the Indian summer monsoon (ISM) and thus, provides a crucial platform to investigate the paleomonsoon variations, weathering intensity, and sediment source. The mudflats of southern Saurashtra, western India are deprived of perennial rivers, but the region receives terrestrial contribution exclusively due to activation of seasonal rivers during the monsoon. In the present study, an attempt has been made to investigate the paleomonsoon and palaeoweathering using various geochemical proxies (detrital, productivity, redox, and weathering) on the mudflat sediment core of southern Saurashtra, western Gujarat. The core is chronologically constrained by 14 C, 210 Pb, and 137 Cs dating techniques. The study suggests ISM strengthening during 2000-1800 cal yr BP with intermittent marginal ISM weakening during 1950-1970 cal yr BP and 1930-1890 cal yr BP associated with the reduced solar irradiance. Further, ISM weakening has been invoked during Dark Age Cold period (1800-1300 cal yr BP) and Little Ice Age (800-200 cal yr BP) interrupted by a marginal ISM strengthening during Medieval Warm period and the last two centuries witness climate warming. Based on historical rainfall data and Al 2 O 3, an intermittent strengthening of ISM during 90-30 cal yr BP has been suggested while a gradual increase in the weathering intensity synchronous to the rise in sea surface temperature (SST) during the last 200 cal yr BP revealed the role of temperature on the intensity of chemical weathering in the study area. In spite of changes in the geochemical proxies as a function of ISM fluctuations, the palaeoweathering intensities has remained nearly consistent wherein the chemical weathering was less operative and accompanied by the deposition of texturally immature sediments. The sediments of Diu mudflat indicate mafic signatures thereby underscoring a major contribution of the Deccan basalts along with other variable sources.

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The intensity of chemical weathering: Geochemical constraints from marine detrital sediments of Triassic age in South China

Cited by 57 publications

References 89 publications

Clinoform identification and correlation in fine‐grained sediments: A case study using the Triassic Montney Formation

Clinoform identification and correlation in fine‐grained sediments: A case study using the Triassic Montney Formation

Chemical Weathering Intensity and Terrigenous Flux in South China during the Last 90,000 Years—Evidence from Magnetic Signals in Marine Sediments

Hydroclimate variability during the last two millennia from the mudflats of Diu Island, Western India

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