The late-Holocene records of sediment provenance/weathering in the Wular Lake catchment, Northwest Himalaya

2021 ◽  
Author(s):  
Nafees Ahmad ◽  
Satinder Pal Singh ◽  
Aasif Mohmad Lone
Keyword(s):  
Lake Sediments ◽  
Late Holocene ◽  
Sediment Provenance ◽  
Silicate Weathering ◽  
Lake Area ◽  
Nd Isotope ◽  
Northwest Himalaya ◽  
Wular Lake ◽  
Weathering Intensity ◽  
Lake Catchment

<p>The Wular Lake (area ~189 km<sup>2</sup>) in the Kashmir Valley (area ~16,000 km<sup>2</sup>) is fed by the Jhelum River, which is a large Himalayan tributary of the Indus River. The lake catchment seasonally receives precipitation from tropical (Indian Summer Monsoon, ISM) and subtropical (Western Disturbances, WD) moisture sources. Thus, the lake sediments provide a unique opportunity to explore the high-resolution archive of the synoptic-scale weathering intensity and pattern in the Northwest Himalaya under past hydroclimatic conditions. In this study, radiogenic Sr and Nd isotope compositions and lithic fractions (sand, silt, and clay) have been determined on detrital phases of a 2.2 m long sediment core retrieved from the Wular Lake. The <sup>14</sup>C-AMS chronology of this core presents the sedimentary records of the last 4.2 ka. The Sr and Nd isotope data indicate that the lake sediments deposited during the late-Holocene are mostly sourced from the Tethyan Himalaya rather than other major lithologies. The marginal downcore variations of ±1.5 ε<sub>Nd</sub> unit (except two anomalous datapoints with large uncertainties at 0.8 ka and 2.0 ka) reveal no major shifts in the sediment provenance during the late-Holocene. On the other hand, the significant downcore variations are observed in <sup>87</sup>Sr/<sup>86</sup>Sr (>0.001–0.004) showing well-resolved periods of higher and lower values than the late-Holocene average. The <sup>87</sup>Sr/<sup>86</sup>Sr data unbiased by the grain-size sorting and carbonate contents seem to indicate a temporal dominance of chemical and physical modes of silicate weathering in the Northwest Himalaya before and after ~2 ka, respectively. Interestingly, an abrupt shift in the <sup>87</sup>Sr/<sup>86</sup>Sr data during the Little Ice Age (~0.4–0.1 ka) reveals a multi-decadal response of the silicate weathering intensity in synchrony with the northern hemisphere temperature anomaly.</p><p> </p>

scholarly journals Diversity and Composition of Bacterial Community in Soils and Lake Sediments from an Arctic Lake Area

2016 ◽  
Vol 7 ◽  
Author(s):  
Neng Fei Wang ◽  
Tao Zhang ◽  
Xiao Yang ◽  
Shuang Wang ◽  
Yong Yu ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Lake Sediments ◽  
Lake Area ◽  
Arctic Lake

Responses of silicate weathering intensity to the Pliocene-Quaternary cooling in East and Southeast Asia

2022 ◽  
Vol 578 ◽  
pp. 117301
Author(s):  
Fangliang Li ◽  
Shouye Yang ◽  
Daniel O. Breecker ◽  
Evan J. Ramos ◽  
Xiangtong Huang ◽  
...  
Keyword(s):  
Southeast Asia ◽  
Silicate Weathering ◽  
Weathering Intensity ◽  
East And Southeast Asia

HOLOCENE PALEOENVIRONMENT AND PREHISPANIC LANDSCAPE EVOLUTION IN THE BASIN OF MEXICO

2015 ◽  
Vol 26 (2) ◽  
pp. 375-389 ◽  
Author(s):  
Emily McClung de Tapia
Keyword(s):  
Lake Sediments ◽  
Human Impact ◽  
Human Activity ◽  
Late Holocene ◽  
Landscape Evolution ◽  
Future Research ◽  
Human Adaptation ◽  
The Past ◽  
Basin Of Mexico ◽  
Ecosystem Evolution

AbstractPaleoenvironmental and geoarchaeological data generated over the past three decades for parts of the Basin of Mexico are little known among archaeologists working in the region. This paper summarizes and evaluates what is currently known about the prehistoric environment, landscape development, and human impact in the region. Archaeological evidence indicates that human activity became important in ecosystem evolution in the basin during the Middle-Late Holocene. Most traditional paleoenvironmental studies based on lake sediments, however, generalize results corresponding to this period simply asevidence for human impact. Essentially the same vegetation communities extant in the basin today appear to have been present during most of the Holocene, albeit with broader distributions and variability in secondary taxa. Recognizing potential contributions of archaeology to understanding human adaptation to climatic and ecosystemic change, past and present, should stimulate future research on paleoenvironment in the region.

Geochemical time series from lake sediments of the Central Asia as chronologic evidence of environmental change over the Late Holocene

2006 ◽  
Vol 25 (S1) ◽  
pp. 6-6
Author(s):  
Andrey V. Daryin ◽  
Ivan A. Kalugin ◽  
Lubov G. Smolyaninova ◽  
Konstantin V. Zolotarev ◽  
Elena G. Vologina ◽  
...  
Keyword(s):  
Time Series ◽  
Environmental Change ◽  
Central Asia ◽  
Lake Sediments ◽  
Late Holocene

scholarly journals Late Holocene paleoenvironmental changes in subtropical Taiwan inferred from pollen and diatoms in lake sediments

2008 ◽  
Vol 41 (2) ◽  
pp. 315-327 ◽  
Author(s):  
Su-Hwa Chen ◽  
Jiunn-Tzong Wu ◽  
Tien-Nan Yang ◽  
Pei-Pei Chuang ◽  
Shu-Yue Huang ◽  
...  
Keyword(s):  
Lake Sediments ◽  
Late Holocene ◽  
Paleoenvironmental Changes

A mid- to late-Holocene record of vegetation decline and erosion triggered by monsoon weakening and human adaptations in the south-east Indian Peninsula

The Holocene ◽  
2017 ◽  
Vol 27 (12) ◽  
pp. 1976-1987 ◽  
Author(s):  
Meng Cui ◽  
Zhanghua Wang ◽  
Kakani Nageswara Rao ◽  
S J Sangode ◽  
Yoshiki Saito ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Late Holocene ◽  
Central India ◽  
Vegetation Coverage ◽  
Sediment Provenance ◽  
C3 Plants ◽  
Agricultural Activity ◽  
Mineral Concentration ◽  
Indian Peninsula ◽  
Deccan Plateau

The mid- to late-Holocene monsoon decline led to aridification of the Indian Peninsula impacting the early agricultural practices in the region. Our analysis of organic carbon, mineral magnetic properties and AMS 14C dating of a 54.2-m-long sediment core (CY) from the Godavari Delta, India, showed changes in the organic carbon source and sediment provenance, which are linked to the changes in vegetation and soil/rock erosion caused by widespread aridification and associated human adaptation in central India. Our results show a decline in the concentration of ferrimagnetic minerals, indicating reduced input from the basalts of the Deccan Plateau after ~6.0 cal. ka BP in response to the weaker Indian monsoon. δ13C values show a distinct increase from ~4.9 cal. ka BP, indicating an increase in C4 plant sources under the continued weak monsoon phase, whereas a higher ferrimagnetic mineral concentration in the sediment suggested an increased Deccan basalt source. Abrupt increase in δ13C values and decrease in TOC content accompanied with a significant increase in ferrimagnetic mineral concentration from ~3.2 to 3.1 cal. ka BP reflected a shift of organic carbon and sediment source and a severe decline in vegetation coverage. Such phenomena indicate intensified deforestation and soil/rock erosion in the Deccan Plateau producing higher ferrimagnetic mineral inputs, which is in agreement with significant expansion of agricultural activities in the Deccan Chalcolithic cultural period. In addition, C3 plants recovered and magnetic concentration declined during the wet events (4.6 and 4.0 cal. ka BP) of Neolithic time, while both C3 plants and magnetic parameters increased during the wet events (3.1–2.8 and 2.1 cal. ka BP) of the Chalcolithic cultural period. This implies increased agricultural activity and the onset of human modification of the ecosystem.

Late Holocene high precipitation events recorded in lake sediments and catchment geomorphology, Lake Vuoksjávrátje, NW Sweden

Boreas ◽  
2015 ◽  
Vol 44 (4) ◽  
pp. 676-692 ◽  
Author(s):  
Annika Berntsson ◽  
Krister N. Jansson ◽  
Malin E. Kylander ◽  
Francois De Vleeschouwer ◽  
Sebastien Bertrand
Keyword(s):  
Lake Sediments ◽  
Late Holocene ◽  
High Precipitation Events ◽  
High Precipitation ◽  
Precipitation Events
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