Rare earth element geochemistry of Post- to Neo-archean shales from Singhbhum mobile belt, Eastern India: implications for tectonic setting and paleo-oxidation conditions

Mir, Akhtar R.

doi:10.1007/s11631-015-0052-8

Cited by 26 publications

(4 citation statements)

References 26 publications

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“…Particularly, the geochemical signature, comprising of major, trace and rare earth elements (REEs) geochemistry, of siliciclastic sediments is indicative of several interacting variables such as provenance, weathering, transportation and diagenesis [10] [11] [12] [13]. A number of recent geochemical studies on ancient and modern clastic sediments from different parts of the world have been carried out and provided some valuable information on the source rock composition [14]- [20], climate, mode of transportation, depositional environment, degree of source rock weathering [21] [22] [23], tectonic setting and post depositional processes such as diagenesis and metasomatism [24] [25] [26] [27] [28].…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of Cretaceous Mudrocks and Sandstones from Douala Sub-Basin, Kumba Area, South West Cameroon: Constraints on Provenance, Source Rock Weathering, Paleo-Oxidation Conditions and Tectonic Environment

Ngueutchoua¹,

Ngantchu²,

Youbi³

et al. 2017

IJG

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Geochemical data of fifteen Cretaceous sediment samples from Kumba area in the Douala sub-basin are presented to determine the provenance, source rock weathering, tectonic setting and paleo-oxidation conditions of the depositional setting of these rocks. For this purpose, the whole-rocks were analyzed for their major and trace element, including rare earth elements (REEs), contents by ICP-AES and ICP-MS methods respectively. On the basis of their major element composition, the rocks have been classified mainly as Fe-shale, shale, arkose and Fe-sandstone. For the provenance, the plot of Zr vs. 1.03. This is also confirmed by the values of Ni/Co (less than 7), U/Th (less than 1.25) and Cu/Zn (mostly less than 1). Tectonic discrimination diagrams (e.g., SiO 2 -K 2 O/Na 2 O and Th-Sc-Zr/10) show that these rocks were deposited mainly in an active continental margin setting, and in various tectonic environments. This reflects probably the recycling effect experienced by the samples studied.

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Section: Introductionmentioning

confidence: 99%

Geochemistry of Cretaceous Mudrocks and Sandstones from Douala Sub-Basin, Kumba Area, South West Cameroon: Constraints on Provenance, Source Rock Weathering, Paleo-Oxidation Conditions and Tectonic Environment

Ngueutchoua¹,

Ngantchu²,

Youbi³

et al. 2017

IJG

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“…Oxidizing environments are characterized by low values of Uranium (U), whereas oxygen-depleted environments are rich in U content [75][76][77][78]. In addition, trace elemental ratios (Cu/Zn, Ni/Co, V/Ni, and V/Cr) have been used to interpret the paleo-redox conditions [79][80][81][82][83][84][85]. Jones and Manning [82] stated that oxic depositional settings are enriched in Cobalt (Co) relative to Nickel (Ni), reflected by low values of Ni/Co ratios, while high values suggest anoxic conditions.…”

Section: Geochemistrymentioning

confidence: 99%

“…Dill [81] and Mir [85] reported that sediments that accumulated in reducing environments are commonly associated with vanadium (V) versus chromium (Cr) which is not directly related to the redox conditions. High values of V/Cr ratio (>2) reflect sediment deposition in anoxic conditions, and low values (<2) indicate oxic conditions [82].…”

Section: Geochemistrymentioning

confidence: 99%

Paleoclimate and Paleoenvironment Reconstructions from Middle Eocene Successions at Beni-Suef, Egypt: Foraminiferal Assemblages and Geochemical Approaches

et al. 2023

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The Eocene deposits of Egypt provide a wide variety of shallow marine facies and fossil assemblages, allowing paleoenvironmental reconstructions in this warmhouse climate interval. Forty-three rock samples have been collected from two middle Eocene sections, exposed at southeast Beni-Suef area in northern Egypt. The studied outcrops are lithologicsally subdivided into two rock units named from base to top as follows: (1) the Qarara Formation (Lutetian) and (2) the El Fashn Formation (Bartonian). Most investigated rock samples showed richness in benthic foraminiferal assemblages and only rare occurrences of index planktonic foraminifera. They yielded 160 foraminifera species which belong to 4 suborders, 19 superfamilies, 34 families, and 59 genera. The stratigraphic distribution of the identified species allowed us to define four local benthic bio-ecozones: (1) Bolivina carinata Lowest Occurrence Zone (Lutetian), (2) Cibicides mabahethi/Cancris auriculus primitivus Concurrent-Range Zone, (3) Nonion scaphum Lowest Occurrence Zone, and (4) Brizalina cooki/Nonionella insecta Concurrent-Range Zone (Bartonian). These biozones are described and discussed in detail and correlated to stratigraphic equivalents in Egypt. The rareness of index planktonic foraminifera through the studied sections does not allow a precise biostratigraphic and chronostratigraphic correlation. The shale samples show low TOC values, which may be related to low productivity, high sediment influx, and/or prevailing oxic conditions. Bulk rock geochemistry, consistent with the benthic foraminifera ecological preferences, indicated that the studied sections were deposited in moderate to high oxygen levels and warm climatic conditions in a typical shelf marine setting. The identified species showed strong similarities with nearby southern Tethys areas, reflecting migration via the trans-Sahara seaway, and minor similarities with those identified from the northwestern Tethys and the North Atlantic province attributed to the change in the environmental and climatic conditions, such as cooler, latitudinal zoned climatic conditions along the northwestern Tethys, which was unsuitable for their biological demands. The warming trend identified from Lutetian to Bartonian intervals corresponds to the onset of the Middle Eocene Climatic Optimum (MECO).

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“…Redox conditions U, Th, V, Cr, Ni, Co, Cu, and Zn elements are redoxsensitive and provide reconstructions of oxygen conditions in sedimentary environments (Martinez-Ruiz et al, 2015). Geochemical parameters such as authigenic U, Th/U, Ni/ Co, V/Cr, and Cu/Zn are very helpful for determining paleoredox conditions during sediment deposition (Wignall and Myers, 1988;Tribovillard et al, 2006;Yang et al, 2011;Rimmer, 2004;Mir, 2015). The authigenic uranium content (U A ) is regarded as an index of bottom water condition and is calculated as authigenic U = (total U) -Th / 3.…”

Section: Source Rock Weatheringmentioning

confidence: 99%

The mineralogical and geochemical composition of Holocene sediments from Lake Hazar, Elazığ, Eastern Turkey: implications for weathering, paleoclimate, redox conditions, provenance, and tectonic setting

Akkoca¹,

Eriş²,

Çağatay³

et al. 2019

Turkish J Earth Sci

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Mineralogical and geochemical analyses of samples collected from piston core HZ11-P01 at the western margin of Lake Hazar were studied to determine the provenance and weathering conditions on the source area together with tectonic setting of the source rocks, paleoclimate of the region, and paleo-redox conditions of the lake sediments. Nonclay minerals in the sediment core are represented by feldspar, quartz, dolomite, and calcite. The clay mineral assemblage consists of smectite/chlorite mixed-layer clay, chlorite, and illite. Most major, trace, and rare earth element contents of the lake samples are generally similar to those of the catchment area. Chondrite-normalized rare earth element patterns of the lake samples are characterized by enrichment of light rare earth elements, a relatively flat heavy rare earth element pattern, and no Eu negative anomaly. The chemical index of alteration and index of compositional variability of the core sediment suggested that the intensity of weathering in the source area was low to moderate. The paleoclimatic indicator (C-values) showed that a paleoclimate changing from semiarid to semimoist prevailed during the last ~2 ka BP. Authigenic U and element ratios such as Th/U, Ni/Co, Cu/Zn, V/Cr, Eu/Eu*, and Ce/Ce* indicate that the lake sediments were deposited under oxic conditions. La/Sc, Co/Th, Cr/Th, Zr/Sc, and Th/Sc element ratios in the core sediments are consistent with values of sediments derived from mainly mafic and intermediate source rocks. According to discriminant-function diagrams, lake samples are plotted within the arc setting and arc-continent collision, which is in accordance with the geology of the study area.

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Rare earth element geochemistry of Post- to Neo-archean shales from Singhbhum mobile belt, Eastern India: implications for tectonic setting and paleo-oxidation conditions

Cited by 26 publications

References 26 publications

Geochemistry of Cretaceous Mudrocks and Sandstones from Douala Sub-Basin, Kumba Area, South West Cameroon: Constraints on Provenance, Source Rock Weathering, Paleo-Oxidation Conditions and Tectonic Environment

Geochemistry of Cretaceous Mudrocks and Sandstones from Douala Sub-Basin, Kumba Area, South West Cameroon: Constraints on Provenance, Source Rock Weathering, Paleo-Oxidation Conditions and Tectonic Environment

Paleoclimate and Paleoenvironment Reconstructions from Middle Eocene Successions at Beni-Suef, Egypt: Foraminiferal Assemblages and Geochemical Approaches

The mineralogical and geochemical composition of Holocene sediments from Lake Hazar, Elazığ, Eastern Turkey: implications for weathering, paleoclimate, redox conditions, provenance, and tectonic setting

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