The Transantarctic Mountains

Faure, Gunter; Mensing, Teresa M.

doi:10.1007/978-90-481-9390-5

Cited by 36 publications

(39 citation statements)

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“…where BABI (basaltic achondrite best initial) 87 Sr/ 86 Sr = 0.69908 [48]. Uranium was purified from digested uraninite samples using UTEVA resin as outlined in Martinelli et al [49].…”

Section: Bulk Sample Pb Sr and U Isotope Ratios By Sm-mc-icp-msmentioning

confidence: 99%

The Role of Continental Crust in the Formation of Uraninite-Based Ore Deposits

et al. 2020

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This study reports trace element abundances and Pb, Sr, and U isotopic signatures of uraninite from a variety of ore deposits in order to establish baseline forensic information for source attribution of raw, natural U-rich samples. Trace element concentrations, reported here, provide insights into uraninite crystal substitution mechanisms and possible crustal sources of U, including mobility of trace elements between pristine versus altered fractions. Spatially resolved laser ablation (LA) multicollector (MC) inductively coupled plasma mass spectrometry (ICP-MS) analyses were used to determine secondary 207Pb-206Pb isochron ages, and these were validated by corroborative results obtained by solution mode (SM) MC-ICP-MS for the same sample. Secondary Pb-Pb isochron ages obtained, in this study, indicate that uraninite alteration occurs shortly after ore mineralization. Initial 87Sr/86Sr values correlate in general with host craton age, and therefore suggest that uraninite ore formation is closely linked to the nature of the bedrock geology. The δ238U values are explained by invoking multiple physicochemical conditions and parameters such as temperature, nuclear field shift, oxidation, and source rock composition. The δ234U values indicate that the uraninites, investigated here, have undergone recent alteration, but the latter has not perturbed the Pb-Pb secondary isochron ages.

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“…where BABI (basaltic achondrite best initial) 87 Sr/ 86 Sr = 0.69908 [48]. Uranium was purified from digested uraninite samples using UTEVA resin as outlined in Martinelli et al [49].…”

Section: Bulk Sample Pb Sr and U Isotope Ratios By Sm-mc-icp-msmentioning

confidence: 99%

The Role of Continental Crust in the Formation of Uraninite-Based Ore Deposits

et al. 2020

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“…The main problem with the K-Ar dating method is its inability to detect thermal resetting or excess Ar (Faure and Mensing 2005). As a further complication, laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) zircon dating of SMO ignimbrites (Bryan et al, 2008) …”

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confidence: 99%

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et al. 2013

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Although Basin and Range-style extension affected large areas of western Mexico after the Late Eocene, most consider that extension in the Gulf of California region began as subduction waned and ended ca. 14-12.5 Ma. A general consensus also exists in considering Early and Middle Miocene volcanism of the Sierra Madre Occidental and Comondú Group as subduction related, whereas volcanism after ca. 12.5 Ma is extension related. Here we present a new regional geologic study of the eastern Gulf of California margin in the states of Nayarit and Sinaloa after the end of subduction, implying that preexisting subduction-modifi ed mantle had now become isolated from melt source regions. Our study shows that rifting across the southern-central Gulf Extensional Province began much earlier than the Late Miocene and provided a fundamental control on the style and composition of volcanism from at least 30 Ma. We envision a sustained period of lithospheric stretching and magmatism during which the pace and breadth of extension changed ca. 20-18 Ma to be narrower, and again after ca. 12.5 Ma, when the kinematics of rifting became more oblique.

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“…North Victoria Land (NVL) occupies an interesting position within the tectonic frame of the Antarctica continent, as (i) it is located at the northern termination of the Transantarctic Mountains, an over 4000-km long orogenic belt that physiographically divides the East Antarctica craton from West Antarctica (Faure and Mensing, 2010), and (ii) it includes the western shoulder of the Mesozoic-Cenozoic WARS, one of the largest intracontinental rift systems on Earth (e.g. Behrendt et al, 1991;Tessensohn and Wörner, 1991;Wörner, 1999) (Fig.…”

Section: Geological Outlinementioning

confidence: 99%