Spectral gamma-ray logging of the Grès d'Annot, SE France: An outcrop analogue to geophysical facies mapping and well-log correlation of sand-rich turbidite reservoirs

Šimíček, Daniel; Bábek, Ondřej

doi:10.1016/j.marpetgeo.2014.10.010

Cited by 28 publications

(15 citation statements)

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“…In these two formations, the sandstone facies are more radioactive than the adjacent mudstone and shale, and this is consistent with a freshwater origin (e.g. Schnyder et al ., ; Šimíček et al ., ; Šimíček and Bábek, ). The high concentration of Co and the higher than average value of Mo in these sediments point toward periodical input of freshwater into the Weald Basin (e.g.…”

Section: Discussionsupporting

confidence: 90%

Multi‐proxy approach to palaeoenvironmental modelling: the English Lower Cretaceous Weald Basin

Akinlotan

2017

Geological Journal

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Palaeoenvironmental reconstructions of the Wealden (Lower Cretaceous) in southeast England have been previously based mainly on field and fossil data. This study presents new interpretations of multi-proxy data sets such as sandstone petrography, elemental geochemistry and sideritic ironstones, supplemented by outcrop and clay mineralogical data. The dominance of quartz arenites, kaolinite and thorium and the presence of Zr in the sediments suggest that they were sourced mainly from granitic and/or gneissic rocks. Materials from metamorphic sources are secondary in abundance. The mineral and textural maturity of the sediments coupled with inferred short transport distances suggests reworking from older sources. Palaeoclimatic conditions in the source areas were generally warm and humid in nature, which supported an intensive weathering regime. The nature of the sediments suggests they may have been sourced directly or indirectly from a stable craton. The lithology, facies, sedimentary structures, architecture and gamma ray data confirm the freshwater origin of the sediments. Redox-sensitive trace elements such as Mo, U, V and Co suggest anoxic conditions in the basin. The results presented in this paper reinforce the importance of integrating multi-proxy data sets for interpreting the palaeoenvironmental conditions of sedimentary basins: when traditional data sets such as field and fossil data are not readily available or insufficient to enable adequate interpretations, the integration of petrographic, mineralogical and geochemical data sets may prove to be useful in similar palaeoenvironmental studies.

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Section: Discussionsupporting

confidence: 90%

Multi‐proxy approach to palaeoenvironmental modelling: the English Lower Cretaceous Weald Basin

Akinlotan

2017

Geological Journal

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“…Mudstone and shale of marine or i gin are ex pected to dis play higher ra dio ac tiv ity than the ad ja cent sand stone be cause of higher con tents of or ganic matter that is typ i cal of ma rine en vi ron ments (Šimíèek et al, 2012). In the Ashdown and Wadhurst Clay fms., 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 for these sed i ments (Schnyder et al, 2006;Šimíèek et al, 2012;Šimíèek and Bábek, 2015). Higher gamma-ray counts may be at trib uted to mudstone while low gamma-ray counts may be char ac ter is tic of sand stones and con glom er ates be cause of the ef fect of non-ra dio ac tive quartz, car bon ate ce ment and pore space in the sand fa cies (Šimíèek et al, 2012).…”

Section: Depositional Environmentmentioning

confidence: 64%

“…The con cen tra tions and vari a tions of these three el e ments in rocks de ter mined by spectral gamma-ray method (SGR) pres ent im por tant geo log i cal and geo chem i cal in for ma tion on source rock com po si tion, sorting dur ing trans port and de po si tion, grain size, clay con tent, modal com po si tion of sand stone, po ros ity, or ganic car bon content, weath er ing at source and palaeoclimate con di tions (e.g., Ruffell and Worden, 2000;Šimíèek et al, 2012;Šimíèek and Bábek, 2015). Po tas sium is com mon in many sed i ments that con tain feld spar, mica, clays or chlo ride salts.…”

Section: Introductionmentioning

confidence: 99%

“…Ura nium and thorium have many host phases in sed i men tary rocks and these may in clude clays, feld spars, heavy min er als, phos phates and or ganic mat ter. In mudrocks and ar gil la ceous lime stones, most of the U and Th are sourced from clays, or ganic mat ter, and heavy min er als (Šimíèek et al, 2012;Šimíèek and Bábek, 2015). Po tas sium is leached from feld spars and mus co vite during the for ma tion of kaolinite un der hot and hu mid cli mates while tho rium is con cen trated dur ing weath er ing.…”

Section: Introductionmentioning

confidence: 99%

“…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). It may not be pos si ble to ap ply a global set of el e men tal dis crim i nate for the iden ti fi ca tion of terrigenous sed i ment sources with out a system atic in ves ti ga tion to eval u ate the ef fects of diagenesis or sort ing (e.g., Abanda and Hannigan, 2006;Pe-Piper et al, 2008;Wójcik-Tabol and OEl¹czka, 2009).…”

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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Indonesian Throughflow drove Australian climate from humid Pliocene to arid Pleistocene

Christensen

Renema

Henderiks

et al. 2017

Geophysical Research Letters

103

182

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Late Miocene to mid‐Pleistocene sedimentary proxy records reveal that northwest Australia underwent an abrupt transition from dry to humid climate conditions at 5.5 million years (Ma), likely receiving year‐round rainfall, but after ~3.3 Ma, climate shifted toward an increasingly seasonal precipitation regime. The progressive constriction of the Indonesian Throughflow likely decreased continental humidity and transferred control of northwest Australian climate from the Pacific to the Indian Ocean, leading to drier conditions punctuated by monsoonal precipitation. The northwest dust pathway and fully established seasonal and orbitally controlled precipitation were in place by ~2.4 Ma, well after the intensification of Northern Hemisphere glaciation. The transition from humid to arid conditions was driven by changes in Pacific and Indian Ocean circulation and regional atmospheric moisture transport, influenced by the emerging Maritime Continent. We conclude that the Maritime Continent is the switchboard modulating teleconnections between tropical and high‐latitude climate systems.

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Spectral gamma-ray logging of the Grès d'Annot, SE France: An outcrop analogue to geophysical facies mapping and well-log correlation of sand-rich turbidite reservoirs

Cited by 28 publications

References 24 publications

Multi‐proxy approach to palaeoenvironmental modelling: the English Lower Cretaceous Weald Basin

Multi‐proxy approach to palaeoenvironmental modelling: the English Lower Cretaceous Weald Basin

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

Indonesian Throughflow drove Australian climate from humid Pliocene to arid Pleistocene

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