India, Arabia and Adjacent Regions

Singhvi, A. K.; Bhatt, Nilesh; Glennie, K. W.; Srivastava, Pradeep

doi:10.1002/9781118336311.ch5

Cited by 10 publications

(5 citation statements)

References 147 publications

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“…Using contemporary literature, Singhvi et al (2012) correlated the phase of major coastal aeolianite building with Marine Isotope Stage (MIS) 7, which was overlain by the shell limestone of MIS-5 with an erosional surface linking with a relative lower sea level (MIS-6). However, in the absence of firm geochronological data, their inference was only indicative.…”

Section: Discussionmentioning

confidence: 99%

Optical dating of late Quaternary carbonate sequences of Saurashtra, western India

Sharma

Bhatt

Shukla³

et al. 2017

Quat. res.

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Bioclastic carbonate deposits that formed because of a combination of nearshore marine, fluvial, and aeolian processes, occur along the Saurashtra coast and in the adjacent interior regions of western India. Whether these carbonates formed by marine or aeolian processes has been debated for many decades. The presence of these deposits inland poses questions as to whether they are climate controlled or attributable to postdepositional tectonic uplift. In particular, the debate centres on chronologic issues including (1) appropriate sampling strategies and (2) the use of 230Th/234U and 14C ages on the bulk carbonates. Using traces (<1%) of quartz grains trapped in carbonate matrices, optically stimulated luminescence (OSL) dating of quartz grains, deposited along with the carbonate grains, provides ages for the most recent deposition events. The OSL ages range from >165 to 44 ka for the shell limestones, 75–17 ka for the fluvially reworked sheet deposits, and 80–11 ka for miliolites deposited by aeolian processes. These are younger than the 230Th/234U and 14C ages and suggest that the inland carbonate deposits were reworked from older carbonate sediments that were transported during more arid phases.

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Section: Discussionmentioning

confidence: 99%

Optical dating of late Quaternary carbonate sequences of Saurashtra, western India

Sharma

Bhatt

Shukla³

et al. 2017

Quat. res.

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“…This is known as the northeast monsoon (NEM) or Retreating Monsoon. However, the amount and intensity of both the monsoonal rains have fluctuated since the late Quaternary period (Clift and Plumb, 2008;Gupta et al, 2006;Singhvi et al, 2010Singhvi et al, , 2012. During the last two decades, scientific interest in the reconstruction of the Asian monsoon variations, particularly the SWM, since the late Quaternary to Holocene period has increased significantly.…”

Section: Introductionmentioning

confidence: 99%

Early-Holocene to present palaeoenvironmental shifts and short climate events from the tropical wetland and lake sediments, Kukkal Lake, Southern India: Geochemistry and palynology

et al. 2016

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The Kukkal basin, Tamil Nadu, India, receives most of its rain from the southwest monsoon. A sediment core from Kukkal Lake, preserves a continuous sediment record from the Early Holocene to present (9000 yr BP to present). The present lake is artificial, situated at an elevation of ~1887 m a.s.l.,, in a small basin that appears to have alternated between a and wetland depositional environment. Climate proxies, including sediment texture, TOC, Total Nitrogen (TN), C/N, pollen and geochemical composition indicate a steady progression to wetter conditions, with two stepwise changes at about 8000, and between 3200 and 1800 yr BP. The change at 8000 yr BP appears to correspond to a brief (100-150 yr) dry spell to about 8000 yr BP, followed by grassland with palms, the appearance of ferns just prior to 3200 yr BP, and the establishment of forest between 3200 and about 1800 yr BP.

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“…However, the strong signatures of the hypersaline taxon Suaeda, a C4-type indicator of dry to arid conditions, in pollen zone SDK-II (980-480 cal yr BP) is indicative of a weaker monsoon and consequent waterstressed conditions during this period. Studies on the Indian summer monsoon using different proxies also indicate that the amount and intensity of the monsoonal rains have fluctuated since the early Holocene on the Indian subcontinent (Gupta et al 2006, Thamban et al 2007, Clift & Plumb 2008, Sarkar et al 2009, Singhvi et al 2012, Shah et al 2017, Ali et al 2018. In general the early Holocene has been characterized by monsoon intensification followed by largely arid conditions since the mid Holocene, with intermittent short periods of strengthened monsoonal periods.…”

Section: Suaedamentioning

confidence: 99%

Responses of the mangrove ecosystem to Holocene environmental change in the Sundarban Biosphere Reserve, India

Hait¹,

Behling

2019

Acta Palaeobotanica

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The Sundarban Mangrove Forest in the Sundarban Biosphere Reserve, located at the mouth of the Ganga–Brahmaputra Delta in India, is the most diverse mangrove ecosystem in the world. Sediment cores were taken from two widely separated islands in that reserve: Chamta (CMT) and Sudhyanyakhali (SDK). Pollen analysis and radiocarbon dating were used to study the Holocene development and dynamics of this unique ecosystem. Modern pollen rain study reveals a strong relation between modern pollen rain and the present vegetation, as well as a high rate of Phoenix palludosa pollen production.The pollen records indicate that man-grove existed at CMT from ~5960 and at SDK from ~1520 cal yr BP. Changes in relative sea level, including the frequency and intensity of inundation as well as fluctuating precipitation, have been the major factors along with geomorphic processes that control the development and dynamics of the mangrove in the area during the Holocene. The mid Holocene mangrove at CMT declined, to be progressively replaced by successive communities, and eventually reached climax stage, while the SDK site is transitional in nature. The mangrove responds rapidly to changes in environmental conditions at both locations. Because of large-scale anthropogenic interventions, it is unlikely that similar rapid responses will occur in the future.

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India, Arabia and Adjacent Regions

Cited by 10 publications

References 147 publications

Optical dating of late Quaternary carbonate sequences of Saurashtra, western India

Optical dating of late Quaternary carbonate sequences of Saurashtra, western India

Early-Holocene to present palaeoenvironmental shifts and short climate events from the tropical wetland and lake sediments, Kukkal Lake, Southern India: Geochemistry and palynology

Responses of the mangrove ecosystem to Holocene environmental change in the Sundarban Biosphere Reserve, India

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