Michael M. Joachimski

Friedrich-Alexander-Universität Erlangen-Nürnberg

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Yadong Sun

China University of Geosciences

Oliver Lehnert

Friedrich-Alexander-Universität Erlangen-Nürnberg

Werner Buggisch

Friedrich-Alexander-Universität Erlangen-Nürnberg

Paul B. Wignall

University of Leeds

Giuseppina Balassone

University of Naples Federico II

Nicola Mondillo

University of Naples Federico II

Maria Boni

University of Naples Federico II

Xulong Lai

China University of Geosciences

Emmanuelle Pucéat

Biogéosciences

Mikael Calner

Lund University

Cooperative Institutions

Centre National de la Recherche Scientifique

Chinese Academy of Sciences

Friedrich-Alexander-Universität Erlangen-Nürnberg

China University of Geosciences

Nanjing Institute of Geology and Paleontology

Czech Academy of Sciences, Institute of Geology

Natural History Museum

Université Claude Bernard Lyon 1

Lund University

University of Göttingen

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Palaeoclimate reconstructions of the Middle Jurassic of Kachchh (western India): an integrated approach based on palaeoecological, oxygen isotopic, and clay mineralogical data

Palaeogeography Palaeoclimatology Palaeoecology (2005)

Franz T. Fürsich I. B. Singh Michael M. Joachimski Stefan Krumm Michael Schlirf

Terrigenous sediment

Lithology

Illite

10.1016/j.palaeo.2004.11.026

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Citations (111)

Genesis of the Florida Canyon Nonsulfide Zn Ores (Northern Peru): New Insights Into the Supergene Mineralizing Events of the Bongará District

Economic Geology (2022)

Rita Chirico Nicola Mondillo Maria Boni Michael M. Joachimski Maurizio Ambrosino

Abstract The Florida Canyon Zn deposit in the Bongará Province of northern Peru consists of sulfide and nonsulfide mineralizations within dolomitized strata of the Triassic Chambará Formation, a member of the Triassic-Jurassic Pucará Group. The nonsulfide mineralization, which represents one third of the total resource, formed by supergene alteration of Mississippi Valley-type sulfide bodies. The nonsulfide assemblages occur in stratabound or fault-related, discordant zones that mimic the shapes of the former sulfide zones. Two nonsulfide facies can be distinguished: facies 1 – red zinc ores, which are characterized by smithsonite, or hemimorphite-dominant bodies that formed by direct replacement of primary sulfide assemblages, and facies 2 – white zinc ores, which are characterized by masses of colloform smithsonite formed by replacement of wall rock. The facies are distinct in bulk chemical composition and stable isotope geochemistry. Facies 1 shows high concentrations of Zn, Pb, Fe, Ge, Mn, and As, whereas facies 2 shows only high Zn and Cd concentrations. Enrichments in Ge, which have been reported in other Zn deposits of the Bongará Province, are associated with hemimorphite, Fe hydroxides, and remnant sphalerite in facies 1. The δ13C and δ18O signatures of smithsonite in both facies suggest that meteoric waters infiltrating the precursor sulfide bodies were affected by kinetic fractionation and originated from multiple sources at different altitude.

Supergene (geology)

Ore genesis

Hypogene

10.5382/econgeo.4941

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Stable oxygen isotopes of crocodilian tooth enamel allow tracking Plio-Pleistocene evolution of freshwater environments and climate in the Shungura Formation (Turkana Depression, Ethiopia)

Biogeosciences (2024)

Axelle Gardin Emmanuelle Pucéat Géraldine Garcia Jean‐Renaud Boisserie Adélaïde Euriat

Abstract. This study adopts a new approach describing palaeohydrology and palaeoclimates based on the interpretation of stable oxygen isotopes (δ18Op) recorded in fossil crocodilian teeth. They represent an archive of prime interest for tracking freshwater palaeoenvironmental change, applicable to many palaeontological localities in the world: crocodilian teeth are abundant in continental basins and have been widely distributed since their diversification during the Mesozoic; the enamel phosphate is resistant to diagenesis and retains its original isotopic composition over geological timescales; and their δ18Op mainly relies on that of the crocodilian's home waterbody (δ18Ow), which in turn reflects waterbody types, regional climate, and evaporation conditions. This study presents the first application of this theoretical interpretative model to the Shungura Formation (Lower Omo Valley, Ethiopia), a key witness of the important environmental change in eastern Africa during the Plio-Pleistocene that impacted the evolution of regional faunas, including humans. In this complex and variable environmental context, the δ18Op of coexisting crocodilians allows for the fingerprinting of the diversity of aquatic environments they had access to at a local scale. This study sheds light on two important results: the δ18Op of crocodilian teeth (1) indicates stable aquatic environments in the northern Turkana Depression from 2.97 to ca. 2.57 Ma but a decline in local waterbodies diversity after 2.32 Ma, suggesting increasing aridity, and (2) shows, like previous geochemical studies on palaeosols and bivalves in the area, a significant increase in δ18Ow from 2.97 to ca. 1.14 Ma, likely due to the shifting air stream convergence zones between the West African and Indian Summer Monsoons and/or reduced rainfall over the Ethiopian Highlands.

Paleoecology

Plio-Pleistocene

10.5194/bg-21-437-2024

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Palaeotemperature evolution in the Carnian-Norian transition (Late Triassic): conodont oxygen isotope evidence from the Canadian Cordillera

EGU General Assembly Conference Abstracts (2019)

Yadong Sun M. J. Orchard Michael M. Joachimski

Conodont

Source

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The onset of the Permo-Carboniferous glaciation: reconciling global stratigraphic evidence with biogenic apatite δ ¹⁸ O records in the late Visean

Journal of the Geological Society (2012)

Milo Barham John Murray Michael M. Joachimski David M. Williams

The δ 18 O values of phosphatic microfossils recovered from NW Ireland are used to determine the timing and magnitude of cooling associated with the onset of the Carboniferous glaciation. Microfossil fish δ 18 O apatite demonstrates a +2.4‰ (V-SMOW) shift, which, once corrected for δ 18 O seawater changes owing to evolving ice volumes, equates to an approximate 4.5 °C reduction in equatorial sea surface temperature between the earliest Asbian and the mid-Brigantian (late Visean). Both conodont and microfossil fish δ 18 O apatite indicate stabilization of an ‘icehouse’ climate during the Brigantian and into the Serpukhovian. Substantial late Visean cooling identified herein is in good agreement with global glacioeustatic records. Supplementary material: Further information on the palaeogeography, lithostratigraphy and palaeoenvironments of the sections examined as well as the sample composition and analytical methods of oxygen isotope analyses is available at http://www.geolsoc.org.uk/SUP18511 .

Viséan

10.1144/0016-76492011-102

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Citations (42)

Palaeoecology of Late Triassic Conodonts: Constraints from Oxygen Isotopes in Biogenic Apatite

Acta Palaeontologica Polonica (2010)

Manuel Rigo Michael M. Joachimski

The oxygen isotopic composition of conodont apatite derived from the Late Triassic (Carnian to lower Norian), Pignola 2 and Sasso di Castalda sections in the Lagonegro Basin (Southern Apennines, Italy) was studied in order to constrain the habitat of Late Triassic conodont animals.Oxygen isotope ratios of conodonts range from 18.5 to 20.8‰ V-SMOW, which translate to palaeotemperatures ranging from 22 to 31°C, assuming a δ 18 O of Triassic subtropical sea water of -0.12‰ V-SMOW.These warm temperatures, which are well comparable to those of modern subtropical-tropical oceans, along with the body features of the conodont animal suggest that conodont δ 18 O values reflect surface water temperatures, that the studied conodont taxa lived in near-surface waters, and that δ 18 O values of Late Triassic conodonts can be used for palaeoclimatic reconstructions.

Paleoecology

10.4202/app.2009.0100

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Citations (63)

Integrated Cambrian biostratigraphy and carbon isotope chemostratigraphy of the Grönhögen-2015 drill core, Öland, Sweden

Geological Magazine (2018)

Per Ahlberg Frans Lundberg Mikael Erlström Mikael Calner Anders Lindskog

Abstract The Grönhögen-2015 core drilling on southern Öland, Sweden, penetrated 50.15 m of Cambrian Series 3, Furongian and Lower–Middle Ordovician strata. The Cambrian succession includes the Äleklinta Member (upper Stage 5) of the Borgholm Formation and the Alum Shale Formation (Guzhangian–Tremadocian). Agnostoids and trilobites allowed subdivision of the succession into eight biozones, in ascending order: the uppermost Cambrian Series 3 (Guzhangian) Agnostus pisiformis Zone and the Furongian Olenus gibbosus , O. truncatus , Parabolina spinulosa , Sphaerophthalmus ? flagellifer , Ctenopyge tumida , C. linnarssoni and Parabolina lobata zones. Conspicuous lithologic unconformities and the biostratigraphy show that the succession is incomplete and that there are several substantial gaps of variable magnitudes. Carbon isotope analyses (δ 13 C org ) through the Alum Shale Formation revealed two globally significant excursions: the Steptoean Positive Carbon Isotope Excursion (SPICE) in the lower–middle Paibian Stage, and the negative Top of Cambrian Excursion (TOCE), previously referred to as the HERB Event, in Stage 10. The δ 13 C org chemostratigraphy is tied directly to the biostratigraphy and used for an improved integration of these excursions with the standard agnostoid and trilobite zonation of Scandinavia. Their relations to that of coeval successions in Baltoscandia and elsewhere are discussed. The maximum amplitudes of the SPICE and TOCE in the Grönhögen succession are comparable to those recorded in drill cores retrieved from Scania, southern Sweden. The results of this study will be useful for assessing biostratigraphic relations between shale successions and carbonate facies on a global scale.

Chemostratigraphy

Trilobite

Biozone

Chronostratigraphy

Outcrop

10.1017/s0016756818000298

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Citations (22)

Carbon and oxygen isotopic composition of Silurian brachiopods (Gotland/Sweden): palaeoceanographic implications

Palaeogeography Palaeoclimatology Palaeoecology (1996)

Bernd Wenzel Michael M. Joachimski

δ18O