Geochemistry of Archean shales from the Pilbara Supergroup, Western Australia

McLennan, Scott M.; Taylor, Stuart Ross; Eriksson, Kenneth A.

doi:10.1016/0016-7037(83)90063-7

Cited by 282 publications

(130 citation statements)

References 43 publications

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“…Con sid er ing the higher quan tity of tho rium in re la tion to ura nium and tak ing on the model of Ruffell and Worden (2000) and Schnyder et al (2006) into con sid er ation, it is in ferred that the palaeoclimatic con di tions at the source ar eas were hu mid and hot. This cli ma tic pat tern sub jected the source rocks to severe weath er ing which was also con firmed by the de ple tion of Ca (e.g., McLennan et al, 1983;Alvarez and Roser, 2007). This palaeoclimatic in ter pre ta tion agrees with pre vi ous in ter preta tions from field ob ser va tions and palaeontological ex am i nations (e.g., Kirkaldy, 1947;Allen, 1975Allen, , 1989Allen, , 1991Radley and Allen, 2012).…”

Section: Palaeoclimatementioning

confidence: 73%

“…The Cor nu bia area was par tially cov ered (Wedepohl, 1971(Wedepohl, , 1991 and those reported in this study based on Table 1 Only the enriched elements and (Pb, Ba) are labelled for emphasis by out crops of Permo-Tri as sic beds, the New Red Sand stone in clud ing some vol ca nic de bris and Ju ras sic sed i ments (Allen, 1981(Allen, , 1991An dre, 1991). The en rich ment of Th and the de pletion of Ca also sug gests that these source rocks were sub jected to se vere weath er ing (e.g., McLennan et al, 1983;Alvarez and Roser, 2007). Ev i dence from sand stone pe trog ra phy and clay min er al ogy also sup ports this in ter pre ta tion.…”

Section: Fig 7 Variations Of As Mo and Ni With Depths At Rock-a-nomentioning

confidence: 97%

“…there is a high abun dance of Zr while the con cen tra tions of Ba, Cr, Ni, Rb and Sr are very low com pared to the con cen tra tions of av er age crustal shale. The con cen tra tions of com pat i ble and in com pat ible el e ments (Zr, Cr, Ni, Rb and Sr) in vary ing quan ti ties (e.g., McLennan et al, 1983) may sug gest that the sed i ments were sourced from pas sive con ti nen tal mar gin. The com po si tion of sand stones has also been used to de ci pher the tec tonic settings in the source ar eas (e.g., Dickinson and Suczek, 1979; Bhatia, 1983; Dickinson, 1985).…”

Section: Fig 10 Distribution Of Spectral Gamma-ray Datamentioning

confidence: 99%

“…This early diagenesis is un likely to have caused any sig nif i cant changes to the geo chem i cal com po si tion. On the other hand, the de ple tion of Ca sug gests that it was prob a bly leached dur ing this diagenetic pro cess (e.g., McLennan et al, 1983;Alvarez and Roser, 2007).…”

Section: Diagenesismentioning

confidence: 99%

“…K and U are gen er ally more sol u ble than Th and U is prone to mo bi li sa tion dur ing weath er ing and clay min eral diagenesis (Ruffell and Worden, 2000;Schnyder et al, 2006). De ple tion of K and U dur ing weath er ing and palaeoweathering re flects the du ra tion and se ver ity of weath er ing (e.g., McLennan et al, 1983; Alvarez and Roser, 2007;Ghasemi-Nejad et al, 2010). In terpre ta tion of gamma-ray emis sion of sed i men tary rocks may some times be come prob lem atic where spe cific heavy min er als have high Th or U con tents, re sult ing from high amounts of zircons, uraninites or thorites (Schnyder et al, 2006) while siliciclastic fa cies can also be com pli cated be cause of their multi-com po nent na ture (Šimíèek and Bábek, 2015).…”

mentioning

confidence: 99%

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Geochemical analysis for palaeoenvironmental interpretations – a case study of the English Wealden (Lower Cretaceous, south-east England)

Akinlotan

2016

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Geo chem i cal anal y sis for palaeoenvironmental in ter pre ta tionsa case study of the Eng lish Wealden (Lower Cre ta ceous, south-east Eng land)Oladapo AKINLOTAN 1, * 1 Uni ver sity of Brigh ton, School of En vi ron ment and Tech nol ogy, Lewes Road, Brigh ton, BN2 4GJ, UK Akinlotan, O., 2017. Geo chem i cal anal y sis for palaeoenvironmental in ter pre ta tions -a case study of the Eng lish Wealden (Lower Cre ta ceous, south-east Eng land). Geo log i cal Quar terly, 61 (1): 227-238, doi: 10.7306/gq.1328The el e men tal com po si tion of terrigenous sed i ments is ex tremely im por tant for in ter pret ing the depositional con di tions of sed i men tary bas ins es pe cially when tra di tional data are not avail able or in suf fi cient. For the first time in the pub lished lit er ature, the el e men tal com po si tion of the Lower Cre ta ceous Weald Ba sin (south-east Eng land) is pre sented via X-ray flu o rescence (XRF) and Spec tral Gamma-ray (SGR) meth ods. The con cen tra tions of Zr, Cr, Ni, Rb, and Sr in vary ing quan ti ties sug gest that the sed i ments may have been sourced from a sta ble craton while the en riched re dox-sen si tive el e ments such as Mo and Co con firm the pres ence of anoxic and re duc ing con di tions at the sites of de po si tion. The spec tral gamma-ray data show that the sand stone fa cies are more ra dio ac tive than the ad ja cent mudstone and shale and this trend is con sis tent with a fresh wa ter or i gin. The higher quan tity of tho rium in re la tion to ura nium in di cates hu mid and hot palaeoclimatic con ditions at the source ar eas that fa voured in tense weath er ing. The re sults of these anal y ses re in force the im por tance of the geo chem is try of sed i men tary rocks as use ful tools for un der stand ing the depositional con di tions of sed i men tary bas ins.Key words: el e men tal com po si tion, X-ray flu o res cence, spec tral gamma-ray, palaeoenvironments, Lower Cre ta ceous, south-east Eng land. INTRODUCTIONThe use of the geo chem i cal com po si tion of sed i men tary rocks for in ter pret ing palaeo-and depositional en vi ron ments is well-doc u mented (e.g., Alvarez and Roser, 2007;Pe-Piper et al., 2008;Ghasemi-Nejad et al., 2010;González-Álvarez and Kerrich, 2010; Eker et al., 2012;Garnit et al., 2012;Pi et al., 2014;Wójcik-Tabol, 2015). The el e men tal com po si tion of terrigenous sed i ments is ex tremely im por tant for in ter pret ing the depositional con di tions of sed i men tary bas ins and may be more use ful than ex pected when tra di tional data such as field ob ser va tions and palaeontological ex am i na tions are not available or in suf fi cient. The geo chem i cal com po si tion of terrigenous sed i men tary rocks is a func tion of tec tonic set ting, prov e nance, weath er ing, trans por ta tion and diagenesis (e.g., Bhatia and Crook, 1986; Alvarez and Roser, 2007;González-Álvarez and Kerrich, 2010). Many ma jor el e ments such as Fe, K, Ca, Ti and Mn in de creas ing or der of abun dance may be af fected by diagenesis or bi o log ...

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Section: Palaeoclimatementioning

confidence: 73%

Section: Fig 7 Variations Of As Mo and Ni With Depths At Rock-a-nomentioning

confidence: 97%

Section: Fig 10 Distribution Of Spectral Gamma-ray Datamentioning

confidence: 99%

Section: Diagenesismentioning

confidence: 99%

mentioning

confidence: 99%

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Geochemical analysis for palaeoenvironmental interpretations – a case study of the English Wealden (Lower Cretaceous, south-east England)

Akinlotan

2016

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Geochemistry of the Cambrian Sirius Passet Lagerstätte, Northern Greenland

Boudec

Ineson

Rosing

et al. 2014

Geochem. Geophys. Geosyst.

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The lower Cambrian Sirius Passet Lagerst€ atte (518 Ma) consists of mudstones about 8 m thick located in the Franklinian Basin of North Greenland. We analyzed major and trace elements plus the S, C, Cu, Fe, Zn, and Mo isotope compositions. Factor analysis allowed the lithology of the mudstone to be broken down into variable proportions of two inputs, a dry felsic component and a hydrous mafic component (smectite or chlorite). Zircons U-Pb ages indicate multiple sources, the local Proterozoic basement of Northern Greenland (1250-2400 Ma) and Pan-African felsic magmas (620-650 Ma) from across the Iapetus ocean. Diagenesis involved the reduction of Fe, S, and Mo from seawater and pyritization. The Sirius Passet Lagerst€ atte formed in oxygen-starved muds inhibiting degradation of organic matter underneath a wellventilated water column. The chemistry of the samples, their very fine grain size, their apparent lack of graded bedding, and the age of zircons suggest that the Lagerst€ atte may represent wind-blown dust deposited on the continental slope.

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Petrography and geochemistry of the late Eocene–early Oligocene submarine fans and shelf deposits on Lemnos Island, NE Greece. Implications for provenance and tectonic setting

Maravelis

Zelilidis

2010

Geological Journal

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Provenance and tectonic history of the late Eocene-early Oligocene submarine fans and shelf deposits on Lemnos Island, NE Greece, were studied using sandstone framework composition, sedimentological data and sandstone and mudstone geochemistry. The resulting tectonicsedimentological model is based on the late Eocene-early Oligocene Lemnos Island being in a forearc basin with the outer arc ridge as a major sediment source. Modal petrographic analysis of the studied sandstones shows that the source area comprises sedimentary, metamorphic and plutonic igneous rocks deposited in the studied area in a recycled orogenic environment. Moreover, within the above sediments, the minor occurrence of volcanic fragments suggests little or no influence of a volcanic source. Provenance results, based on major, trace and rare earth element (REE) data, suggest an active continental margin/continental island arc signature. All the samples are LREE, enriched relative to HREE, with a flat HREE pattern and positive Eu anomalies, suggesting that the processes of intracrustal differentiation (involving plagioclase fractionation) were not of great importance. Results derived from the multi-element diagrams also suggest an active margin character, and a mafic/ultramafic source rock composition, while the positive anomaly of Zr that can be attributed to a passive continental margin source, is most likely associated with reworking and sorting during sediment transfer. Palaeocurrents, with a NE-NNE direction, indicate a northeast flow, towards the location of the late Eocene-early Oligocene magmatic belt in the north-east Aegean region. Conglomerates are composed of chert, gneiss and igneous fragments, such as basalts and gabbros, suggesting this outer arc ridge as a likely source area.

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Geochemistry of Archean shales from the Pilbara Supergroup, Western Australia

Cited by 282 publications

References 43 publications

Geochemical analysis for palaeoenvironmental interpretations – a case study of the English Wealden (Lower Cretaceous, south-east England)

Geochemical analysis for palaeoenvironmental interpretations – a case study of the English Wealden (Lower Cretaceous, south-east England)

Geochemistry of the Cambrian Sirius Passet Lagerstätte, Northern Greenland

Petrography and geochemistry of the late Eocene–early Oligocene submarine fans and shelf deposits on Lemnos Island, NE Greece. Implications for provenance and tectonic setting

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