Evaluation of terrigenous input, diagenetic alteration and depositional conditions of Lower Carboniferous carbonates of Tethys Himalaya, India

Ganai, Javid A.; Rashid, Shaik A.; Romshoo, Shakil Ahmad

doi:10.1016/j.sesci.2018.03.002

Cited by 21 publications

(11 citation statements)

References 83 publications

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“…The contents of Ni and Zn of carbonate fraction of the regional marbles are also comparable to Proterozoic seawater (Saito, Sigman, & Morel, 2003; Veizer et al, 1992). Also, lower content of V, Cr, and Co which can be enriched through terrigenous input may be indicative for the marine origin of these rocks (Ganai, Rashid, & Romshoo, 2018).…”

Section: Discussionmentioning

confidence: 99%

Mineralogical and geochemical constraints on the provenance and depositional setting of Sri Lankan marbles

Madugalla

Pitawala

2021

Geological Journal

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Proterozoic high‐grade marbles cover a significant portion of the Highland Complex (HC) of Sri Lanka. Although many studies on metamorphic silicate rocks of the country have been carried out, marbles, which can be used as a tool to interpret the evolution history of the crust, has been paid little attention. The present study aims to understand the genesis and characteristics of protolith of these marbles by investigating their mineralogy and geochemistry. The studied marbles occur as bands intercalated with pelitic gneisses and quartzites of the HC, indicating the pre‐existing sandstone‐shale‐carbonate sedimentary sequence. Except along the lithological contacts, the studied marbles contain low amounts of silicate minerals (<5%) and are dominated by dolomites (>90%) with minor calcites. Calcites occur as inclusions within dolomites or as fine grains along the grain boundaries of dolomites. Silicate minerals always occur as lensoid or layered aggregations. Dolomites are related to the protolith composition, while most of the calcites are metamorphic products formed due to the reaction of silicate minerals with dolomite. Silicate mineralogical zones suggest the inherited compositional variations of the protolith. Although the marbles have undergone granulite‐grade metamorphism, their trace elemental contents have been well preserved. Concentrations of Fe, Mn, Sr, Na, and K as well as rare earth element (REE) contents of the marbles are comparable to those of marine origin carbonates. Hence, marine dolostone can be proposed as the protolith for Sri Lankan marbles. The distinct mineralogy as well as elevated trace element and REE concentrations of marble in the lithological contact zones are evidenced for prevailed syn‐ to post‐metamorphic fluid activities in the HC. Mineralogical and trace elemental composition of Sri Lankan marbles are correlated well with the marbles from other East‐Gondwanaland crustal units.

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Section: Discussionmentioning

confidence: 99%

Mineralogical and geochemical constraints on the provenance and depositional setting of Sri Lankan marbles

Madugalla

Pitawala

2021

Geological Journal

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“…Factor 1 is also explained by moderate positive loadings of U, which indicates redox conditions of the seawater. Factor 2 explains 16.85% of the total variance with the positive loadings of Si, Al, Ti, P, V, Zr and Th, suggestive of terrigenous fraction-controlled nature (Ganai et al 2018;Li et al 2019a, b). The association of these elements with detrital fractions correlates to the preserved depositional signatures of the precursor HCM in the dolomites.…”

Section: Geochemical Characteristics Of Hcm (P1) and Dolomites (P2-p5)mentioning

confidence: 98%

“…The association of these elements with detrital fractions correlates to the preserved depositional signatures of the precursor HCM in the dolomites. However, few of the trace elements may also have been controlled by the diagenetic fluids as selected elements can be remobilized from carbonate and non-carbonate fractions (Ganai et al 2018). Factor 3 has negative loadings of Mn, Mg and Na and positive loadings of Ca, Ba and Sr.…”

Section: Geochemical Characteristics Of Hcm (P1) and Dolomites (P2-p5)mentioning

confidence: 99%

“…Application of major, trace and rare earth elements (REE) as geochemical proxies is gaining wide acceptance in carbonate provenance studies and the environmental settings during carbonate deposition/precipitation (Banner et al 1988a, b;Kamber and Webb. 2001;Nothdurft et al 2004;Frimmel 2009;Nagarajan et al 2011;Azomani et al 2013;Zhao and Jones 2013;Zhao and Zheng 2014;Li et al 2017;Srivastava and Singh 2019;Guruaribam et al 2021) and post-depositional alteration (Delpomdor et al 2013;Nagarajan et al 2013;Wang et al 2014;Franchi et al 2015;Ganai et al 2018;Dutt et al 2021). This paper presents petrographic, mineralogical and geochemical data, regarding which discussion on the occurrences of polyphase dolomite geobodies, examination of the strata and structural controls are attempted.…”

Section: Introductionmentioning

confidence: 95%

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Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia

Hui

Nagarajan

Ramkumar

et al. 2022

Carbonates Evaporites

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Study of secondary dolomitization and documentation of the evolution of basinal fluids and host rock, especially that of fine-grained deepwater carbonate mudstone are of interest toward of reservoir characterization. From this perspective, field characteristics in relation to mineralogy, petrography and geochemistry of the Paleaozoic carbonates of the Kinta Valley, Peninsular Malaysia, were investigated and documented. A total of 33 samples were collected across the various degree of dolomitization and analyzed for their petrographic properties (n = 55), while mineralogical and geochemical compositions (n = 33) were analyzed using XRD, ICP and ICPMS analysis, respectively. These analyses were performed to elucidate the diagenetic events, episodic dolomitization and development of fluid evolution as a function of regional tectono-thermal events during the Permian to Cenozoic. It is interpreted that the host calcareous mudstones (HCMs) were deposited in oxygenated, open marine seawaters. The studied samples retain the original seawater characteristics despite negligible, minor alterations of REE characteristics due to diagenesis and detrital input. Though the concentrations and trends of REEs of the dolomitic facies are modified to a certain extent, their affinities with HCMs are preserved. Enrichments of Mg, Mn, Na and depletion of Sr are linked to the effect of dolomitization under the open system of diagenesis. The redox conditions fluctuated to show distinct, recognizable variations between different dolomite phases. The MREE enrichments with other trace elements such as Mn, Fe and low Sr content indicate the association of diagenetic fluids with deep-circulating crustal hydrothermal fluids. Hydrothermal influence has been recorded along the fractures, which might have originated from the sub-surface litho units and facilitated episodic dolomitization, especially during significant tectono-thermal events. This study affirms that the occurrence, geochemical and mineralogical evolution of the dolomites of the Kinta Valley were controlled by magmatic events, whereas the intensity of replacement dolomitization was controlled by host rock texture, varied bulk chemistry of host rock, circulating fluid and temperature.

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“…The trace elements composition in carbonates depends on a number of factors including, but not limited to, original mineralogy, temperature, salinity, redox conditions, nutrients supply, organic activity, and climate. A terrestrial system with humid climate will supply more clay content than sand, which is often a characteristic of arid climates (Ganai, Rashid, & Romshoo, 2018). The deposition of carbonates act as depositional sinks for different elements as major and trace elements are incorporated into the lattices of the calcium carbonate.…”

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confidence: 99%

The physical and geochemical character of the post‐depositional alterations in the Early‐Middle Jurassic carbonates on the western margin of the Indian Plate: Implications for cement morphologies and dolomitization

Saboor

Wang

et al. 2022

Geological Journal

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The physical and geochemical character of the post‐depositional changes present in the Early‐Middle Jurassic carbonate‐dominated units (Samana Suk, Shinawari, Chiltan and Loralai formations) of the Indus Basin, Pakistan have been addressed. The study is based on 11 sections along a N‐S transect on the western margin of the Indian Plate to provide an insight into the nature of cementation and dolomitization behavior by using an integrated petrographic and geochemical analysis. The carbonates located in the northern proximity are dominated by the eogenetic signatures of hardgrounds, biogenic micritization, and iron‐containing burrows. The pattern and yellowish‐brown coloration of the burrows is distinct, and shows a positive relationship with the Fe, Si, Al, K, Mn concentrations, and meteoric phase. The transition from the Early to Middle Jurassic is marked by a correspondent increase in the dolomitization and bioturbation but its intensity decreases from north to the south. The packing index and marine phreatic environments generally increase towards the south. The planar‐s to planar‐e protodolomite and dolomite proper have particularly targeted the micritic facies and allochems, courtesy of retaining high‐magnesian calcite waters, and the geochemical analysis also reveals some dedolomitization, associated with sequence boundaries. The pore occluding cements of the Samana Suk and Chiltan formations are Fe deficient and have low Sr and Mn levels, as compared to the Shinawari Formation. The latter has an elevated concentration of Fe, Mg, Si, Al, Sr, Mn, and the Fe + Mn versus Sr relationship and Mn* values suggest that cementation dominantly occurred in the oxic‐dysoxic zones of sub‐tropical climate.

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Evaluation of terrigenous input, diagenetic alteration and depositional conditions of Lower Carboniferous carbonates of Tethys Himalaya, India

Cited by 21 publications

References 83 publications

Mineralogical and geochemical constraints on the provenance and depositional setting of Sri Lankan marbles

Mineralogical and geochemical constraints on the provenance and depositional setting of Sri Lankan marbles

Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia

The physical and geochemical character of the post‐depositional alterations in the Early‐Middle Jurassic carbonates on the western margin of the Indian Plate: Implications for cement morphologies and dolomitization

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