Geochemical characteristics of Mesoproterozoic clastic sedimentary rocks from the Chakrata Formation, Lesser Himalaya: implications for crustal evolution and weathering history in the Himalaya

Rashid, Shaik A.

doi:10.1016/s1367-9120(02)00071-8

Cited by 20 publications

(8 citation statements)

References 39 publications

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“…Except a slightly lower CaO and Na 2 Ocontent, the average major element composition of the interbedded shale compares with that of the upper continental crust composed of granitoid (table 3). The average composition of shale also compares to that of the shales and pelites of the Mesoproterozoic Chakrata Formation for which derivation of detritus from granite dominated upper continental crust was inferred (Rashid 2002;Raza et al 2002). The Rb/Sr ratio is a measure of determining the intensity of source-rock weathering and sedimentary recycling and is also considered useful for provenance analysis (McLennan et al 1993;Long et al 2008).…”

Section: Trace Elementsmentioning

confidence: 93%

“…The range and average of eleven trace elements for sandstones and shale are presented in et al 1993). The Rb/Sr value of 16 has been interpreted as reflecting intense chemical weathering (Rashid 2002). In comparison, the average Rb/Sr values 0.61 and 0.71 in the studied sandstones and shale respectively (table 2) are lower.…”

Section: Trace Elementsmentioning

confidence: 93%

“…In India, geochemical investigations and provenance analysis of sediments and sedimentary/ meta-sedimentary rocks include studies from Himalaya to Great Nicobar Islands and Nicobar and Bengal Fans (Ingersoll and Suczek 1979;Garzanti and Van Haver 1988;Bhat and Ghosh 2001;Islam et al 2002;Rashid 2002;Raza et al 2002;Absar et al 2009;Ghosh et al 2012a, b;Garzanti et al 2013a). Nevertheless, there has hardly been any attempt to study the geochemistry of turbidites (sandstone-shale rhythmites) from the Andaman-Nicobar convergent margin accretionary Island arc.…”

Section: Introductionmentioning

confidence: 99%

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Provenance analysis of the Oligocene turbidites (Andaman Flysch), South Andaman Island: A geochemical approach

Bandopadhyay

Ghosh

2015

J Earth Syst Sci

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The Oligocene-aged sandstone-shale turbidites of the Andaman Flysch are best exposed along the east coast of the South Andaman Island. Previously undocumented sandstone-shale geochemistry, investigated here, provides important geochemical constraints on turbidite provenance. The average 70.75 wt% SiO 2 , 14.52 wt% Al 2 O 3 ,8. 2w t %F e 2 O t 3 +MgO and average 0.20 Al 2 O 3 /SiO 2 and 1.08 K 2 O/Na 2 Or a t i o s in sandstones, compare with quartzwackes. The shale samples have average 59.63 wt% SiO 2 , 20.29 wt% Al 2 O 3 , 12.63 wt% Fe 2 O t 3 +MgO and average 2.42 K 2 O/Na 2 O and 0.34 Al 2 O 3 /SiO 2 ratios. Geochemical data on CaO-Na 2 O-K 2 O diagram fall close to a granite field and on K 2 O/Na 2 O-SiO 2 diagram within an active continental margin tectonic setting. The range and average values of Rb and Rb/Sr ratios are consistent with acid-intermediate igneous source rocks, while the values and ratios for Cr and Ni are with mafic rocks. Combined geochemical, petrographic and palaeocurrent data indicate a dominantly plutonic-metamorphic provenance with a lesser contribution from sedimentary and volcanic source, which is possibly the Shan-Thai continental block and volcanic arc of the northeastern and eastern Myanmar. Chemical index of alteration (CIA) values suggests a moderate range of weathering of a moderate relief terrane under warm and humid climate.

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Section: Trace Elementsmentioning

confidence: 93%

Section: Trace Elementsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Provenance analysis of the Oligocene turbidites (Andaman Flysch), South Andaman Island: A geochemical approach

Bandopadhyay

Ghosh

2015

J Earth Syst Sci

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“…The geochemistry of sediments has been extensively used by many workers (McLennan et al 2003;Singh et al 2008;Singh and France-Lanord 2002;Rashid 2002Rashid , 2005Rahaman et al 2009;Bertland et al 2012;Pramod Singh 2010), primarily to understand various geological processes and climate control responsible for providing sediments to several basins. The weathering of rocks is an ongoing common process that shapes the earth's surface and controls the biogeochemical cycles, and thereby regulates monsoon patterns.…”

Section: Introductionmentioning

confidence: 99%

Major and trace element geochemistry of lake sediments, India: implications for weathering and climate control

et al. 2014

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Climate plays an essential role in weathering of rocks, and a rich record of climatic change is preserved in rocks and sediments. The physical and chemical weathering also largely depend on climate prevailing in the area, apart from other factors. In an attempt to understand the dominance of physical over chemical weathering processes, the textural and geochemical studies of Wular Lake sediments from Jammu and Kashmir, northern India, have been taken up in the present study. These sediments documented several attentiongrabbing processes that operated during weathering, transportation, and deposition. Investigations have revealed that physical weathering dominated over chemical weathering, resulting in enhanced rates of erosion and consequent deposition of large detritus into the lake. Lake sediments and source rock chemistry are comparable, indicating low to moderate chemical weathering history of the source region which is consistent with cold regions and steep slope areas. Unusual enrichment of Cr values in sediments compared with source rocks signify a process of sediment-water interaction where Cr is removed from water and preferentially adsorbed onto clay fraction of sediments.

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“…For the last many decades, the geologists from all over the world have extensively carried out the geochemical studies of different rock types and river waters in the Himalaya. More recently, several papers have begun to deal specifically with the elemental composition of sediments and sedimentary rocks of the Himalayas (Ahmad et al, 1998;Bhat and Ghosh, 2001;Rashid, 2002). The soil geochemistry in the Himalaya is almost unattended.…”

Section: Introductionmentioning

confidence: 99%

The geochemistry of surface soils from the Garhwal region, NW Lesser Himalaya: an evidence for neotectonic activity in the area

Rashid¹

2005

Journal of Mineralogical and Petrological Sciences

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Geochemical characteristics of Mesoproterozoic clastic sedimentary rocks from the Chakrata Formation, Lesser Himalaya: implications for crustal evolution and weathering history in the Himalaya

Cited by 20 publications

References 39 publications

Provenance analysis of the Oligocene turbidites (Andaman Flysch), South Andaman Island: A geochemical approach

Provenance analysis of the Oligocene turbidites (Andaman Flysch), South Andaman Island: A geochemical approach

Major and trace element geochemistry of lake sediments, India: implications for weathering and climate control

The geochemistry of surface soils from the Garhwal region, NW Lesser Himalaya: an evidence for neotectonic activity in the area

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