Drinking Locally: A Water 87Sr/86Sr Isoscape for Geolocation of Archeological Samples in the Peruvian Andes

Scaffidi, Beth K.; Tung, Tiffiny A.; Gordon, Gwyneth W.; Alaica, Aleksa K.; Rosa, Luis Manuel González La; Marsteller, Sara J.; Dahlstedt, Allisen; Schach, Emily E.; Knudson, Kelly J.

doi:10.3389/fevo.2020.00281

Cited by 20 publications

(10 citation statements)

References 150 publications

(291 reference statements)

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“…This measured ratio does not deviate from the Messinian average global seawater 87 Sr/ 86 Sr that would correspond to three existing independent radiometric dates (Fig. 5), but it is significantly higher than modern strontium values from coastal rivers entering the Pacific Ocean between 14 and 16 ºS, which have catchments dominated by igneous rocks that supply very low 87 Sr/ 86 Sr (ranging from 0.70561 to 0.70809, n = 7; Scaffidi et al 2020). This indicates that, although the Sacaco sub-basin represents a marginal and shallow area, during the Messinian it did not receive large river inputs with different Sr isotopic composition, and so major salinity fluctuations due to changes in the freshwater supply were unlikely to occur when the sediments from the Sacaco locality were accumulated (~ 5.8-5.7 Ma).…”

Section: Coastal Sea Surface Temperaturessupporting

confidence: 53%

Late Neogene evolution of the Peruvian margin and its ecosystems: a synthesis from the Sacaco record

Ochoa

Salas-Gismondi

DeVries

et al. 2021

Int J Earth Sci (Geol Rundsch)

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The highly productive waters of the Humboldt Current System (HCS) host a particular temperate ecosystem within the tropics, whose history is still largely unknown. The Pisco Formation, deposited during Mio-Pliocene times in the Peruvian continental margin has yielded an outstanding collection of coastal-marine fossils, providing an opportunity to understand the genesis of the HCS ecosystem. We present a comprehensive review, completed with new results, that integrates geological and paleontological data from the last 10 My, especially focusing on the southern East Pisco Basin (Sacaco area). We discuss the depositional settings of the Pisco Formation and integrate new U/Pb radiometric ages into the chronostratigraphic framework of the Sacaco sub-basin. The last preserved Pisco sediments at Sacaco were deposited ~ 4.5 Ma, while the overlying Caracoles Formation accumulated from ~ 2.7 Ma onwards. We identified a Pliocene angular unconformity encompassing 1.7 My between these formations, associated with a regional phase of uplift. Local and regional paleoenvironmental indicators suggest that shallow settings influenced by the offshore upwelling of ventilated and warm waters prevailed until the early Pliocene. We present an extensive synthesis of the late Miocene–Pleistocene vertebrate fossil record, which allows for an ecological characterization of the coastal-marine communities, an assessment of biodiversity trends, and changes in coastal-marine lineages in relation to modern HCS faunas. Our synthesis shows that: (i) typical endemic coastal Pisco vertebrates persisted up to ~ 4.5 Ma, (ii) first modern HCS toothed cetaceans appear at ~ 7–6 Ma, coinciding with a decline in genus diversity, and (iii) a vertebrate community closer to the current HCS was only reached after 2.7 Ma. The genesis of the Peruvian coastal ecosystem seems to be driven by a combination of stepwise transformations of the coastal geomorphology related to local tectonic pulses and by a global cooling trend leading to the modern oceanic circulation system.

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Section: Coastal Sea Surface Temperaturessupporting

confidence: 53%

Late Neogene evolution of the Peruvian margin and its ecosystems: a synthesis from the Sacaco record

Ochoa

Salas-Gismondi

DeVries

et al. 2021

Int J Earth Sci (Geol Rundsch)

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“…All of the studied samples from the Gennoishi Formation display quite high Mn/ Sr (0.24 to 4.21) and Fe/Sr (McArthur et al, 2001(McArthur et al, , 2012. In seawater, 87 Sr/ 86 Sr ratio is strongly affected by continental runoff (Bataille & Bowen, 2012;Chesson et al, 2012;Peucker-Ehrenbrink & Fiske, 2019;El Meknassi et al, 2020;Scaffidi et al, 2020) • The influence of organic matter decomposition on ikaite-glendonite transformation and concretion cementation is supported by diagnostic d 13 C values of sedimentary organic matter (Campbell, 2006).…”

Section: Glendonites From the Gennoishi Formationmentioning

confidence: 87%

“…Strontium isotopic compositions of the studied glendonites are significantly lower than those of coeval Palaeogene–Neogene carbonates (McArthur et al., 2001, 2012). In seawater, 87 Sr/ 86 Sr ratio is strongly affected by continental runoff (Bataille & Bowen, 2012; Chesson et al., 2012; Peucker‐Ehrenbrink & Fiske, 2019; El Meknassi et al., 2020; Scaffidi et al., 2020) and in modern volcanic region surface waters show 87 Sr/ 86 Sr as low as 0.7054 (Neumann & Dreiss, 1995). Runoff during Lower Oligocene in the studied region was mostly affected by volcanogenic and clastic rocks from Central Sakhalin (Cretaceous and Jurassic complexes) and volcanic arc formed at the beginning of the Oligocene (see earlier section on stratigraphy).…”

Section: Discussionmentioning

confidence: 99%

Marine diagenesis of ikaite: Implications from the isotopic and geochemical composition of glendonites and host concretions (Palaeogene–Neogene sediments, Sakhalin Island)

et al. 2021

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Glendonites represent pseudomorphs after calcium carbonate hexahydrate (ikaite) and can be used as indicators of past cold climates, because ikaite only naturally occurs in cold environments (<7°C) in the modern. The results of a multi-proxy study of 11 glendonite and host concretion samples from Palaeogene (Gennoishi Formation) and Neogene (Bora and Vengeri formations) sediments from Sakhalin Island, Russian Far East are reported here. Petrographic, cathodoluminescence, powder X-ray diffraction and scanning electron microscope analyses reveal that glendonites are composed of several successive mineralogical phases: low-magnesium ikaite-derived calcite, highmagnesium acicular cement (calcite and dolomite) and blocky calcite or authigenic quartz filling the remaining pore space. Host concretions comprise sandy limestones cemented by high-magnesium calcite. The d 13 C and d 18 O values for host concretions and enclosed glendonites are very similar, with d 13 C ranging from -20.3 to +1.9& Vienna Pee-Dee Belemnite and d 18 O ranging from -3.4 to +3.4& Vienna Pee-Dee Belemnite. Such isotopic values suggest that seawater was the main source of oxygen, while dissolved inorganic carbon and decaying organic matter were the main carbon sources for ikaite growth, concretion and glendonite cementation. The 87 Sr/ 86 Sr values within the glendonites and host concretions are significantly lower compared with coeval Palaeogene-Neogene marine carbonates, suggesting an influence of continental runoff on their isotopic composition. Post Archean Australian Shale normalized rare earth element patterns display negative Ce anomalies and positive Eu anomalies, with a depletion in light rare earth elements or bulge in middle rare earth elements. Such spectra of rare earth elements indicate that ikaite growth and replacement occurred very close to the aerobic-anaerobic boundary, with pore waters derived from trapped seawater and/or ikaite dehydration. Since Mg/Ca ratios and alkalinity increase 2227

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“…Подчеркнем, что ни один образец не продемонстрировал величин равных или приближенных к «водным» показателям. Эта особенность нам представляется важной, так как мнение о роли водных источников в формировании величины стронциевого соотношения в литературе дискутируется (Tipple et al, 2018;Scaffidi et al, 2020). Вопрос о влиянии источника питьевой воды на изотопный состав биоархеологических материалов важен для различных задач археологического исследования, в частности -для радиоуглеродного датирования (Higham et al, 2010).…”

Section: Discussionunclassified

The Glass Beaker With Applique Snake-Thread Decoration From Frontovoye 3

Голофаст¹,

Свиридов²

2022

Краткие Сообщения Института Археологии (КСИА)

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При раскопках грунтового могильника Фронтовое 3 в пригороде Севастополя (Юго-Западный Крым) в захоронении конца II - середины III в. был обнаружен уникальный для Крыма импортный стеклянный кубок с растительным орнаментом, выполненным накладными «змеевидными» нитями. Такой орнамент, известный под названием «snake-thread decoration» или «Schlagenfaden Glas», характерен для продукции Восточного Средиземноморья, Кёльна (и, возможно, ряда других западноевропейских мастерских) и Паннонии. Посуда с такой орнаментацией относится к разряду предметов роскоши и была неотъемлемой частью сервировки стола сельской и городской элиты и, как правило, встречается в богатых захоронениях. Комплекс данных о форме и характере декора сосуда из Фронтового не позволяет определить точное место его изготовления, однако он, вероятно, относится к продукции одной из европейских мастерских. Его находка в одном из захоронений Фронтового хорошо объяснима: в рассматриваемый период юг и часть юго-запада Таврики находились под контролем римской военной администрации, и ее экономические связи с Херсонесом существенно расширились. During the excavations of the in-ground Frontovoye-3 cemetery in a suburb of Sevastopol (southwestern Crimea) an imported glass beaker with a floral ornament made with applique snake-threads was found. The beaker is unique for the Crimea. It was discovered in a grave dating to the end of the 2nd - mid 3rd centuries. This decoration known as snake-thread decoration or Schlagenfaden Glas is typical for the products from the eastern Mediterranean, Cologne (and, possibly, a number of other West European workshops) and Pannonia. Vessels with such ornament were luxury items used as table settings in houses of rural and urban elite; as a rule, they are found in rich burials. The dataset on the form and nature of the decoration on the beaker from Frontovoye does not make it possible to say where exactly it was produced; however, it is likely that it was made in a European workshop. Its discovery in one of the Frontovoye graves can be easily explained. During the discussed period the southern part and some areas in the southwestern part of Taurica were under control of the Roman military administrations and its economic links with Chersoneses were substantially expanded.

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Drinking Locally: A Water 87Sr/86Sr Isoscape for Geolocation of Archeological Samples in the Peruvian Andes

Cited by 20 publications

References 150 publications

Late Neogene evolution of the Peruvian margin and its ecosystems: a synthesis from the Sacaco record

Late Neogene evolution of the Peruvian margin and its ecosystems: a synthesis from the Sacaco record

Marine diagenesis of ikaite: Implications from the isotopic and geochemical composition of glendonites and host concretions (Palaeogene–Neogene sediments, Sakhalin Island)

The Glass Beaker With Applique Snake-Thread Decoration From Frontovoye 3

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