Geologica Acta: an international earth science journal

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Hybridization between I-type and S-type granites in the ordovician famatinian magmatic arc, Tafí del Valle, Tucumán, NW Argentina

J.P. López

L.I. Bellos

J. Díaz-Alvarado

A. Castro

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Abstract: In the Tafí del Valle region, in northwestern Argentina, several intrusive bodies of lower Paleozoic age were emplaced in the metasedimentary Puncoviscana Formation, belonging to the Sierras Pampeanas. Four intrusive bodies outcrop in the study area: La Oveje

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DOI: https://doi.org/10.1344/GeologicaActa2018.16.1.2

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Organic petrology and geochemistry of mudstones from the lower Shahejie Formation, in the Tanggu area of eastern China: evidence for the presence of an ancient saline lake

L. Li

G.Q. Yao

M.J. Cai

H. Liu

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Abstract: Mudstones in the Sha-3 member of the Shahejie Formation, in the Tanggu area of the Huanghua Depression, have been found to contain analcime and ankerite. Hydrothermal sedimentation has been invoked to explain the origin of these two minerals, raising the ques

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DOI: https://doi.org/10.1344/GeologicaActa2018.16.1.3

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Digestive structures in Middle Ordovician trilobite Prionocheilus Rouault, 1847 from the Barrandian area of Czech Republic

O. Fatka

P. Budil

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Abstract: Remains of a digestive system from a slightly damaged articulated specimen of the comparatively rare bathycheilid trilobite Prionocheilus vokovicensis (Šnajdr, 1956) are described for the first time. The specimen comes from the Middle Ordovician Šárka Formati

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DOI: https://doi.org/10.1344/GeologicaActa2018.16.1.4

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Taxonomic revision of the Oligocene percoid fish Oligoserranoides budensis (Heckel, 1856), from the Paratethys and paleobiogeographic comments

M. Bieńkowska-Wasiluk

M. Pałdyna

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Abstract: Small perch-like fishes from the Oligocene of the Paratethys have been traditionally assigned to Serranus budensis (Heckel, 1856). A morphological revision of the holotype and specimens previously assigned to S. budensis from the Outer Carpathians, Poland, is

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DOI: https://doi.org/10.1344/GeologicaActa2018.16.1.5

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Resolution test of GOCE satellite data applied to density anomalies at crustal and upper mantle levels

M. Peral

M. Fernàndez

M. Torne

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Abstract: The Gravity field and steady-state Ocean Circulation Explorer (GOCE) satellite mission was devised by the European Space Agency to study the Earth’s gravity field with an unprecedented accuracy using gravity gradient data. The goal of this study is to analyze

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DOI: https://doi.org/10.1344/GeologicaActa2018.16.1.6

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