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opencc-by-4.0Jul 2024View details →

Supplement to "The virtual spot approach: a simple method for image U-Pb carbonate geochronology by high-repetition rate LA-ICP-MS" by Hoareau et al

This repository contains supplementary data, excel datasets and python / R codes as supplement to the publication by Hoareau et al. Files are: <ul> <li>pdf with Supplementary material (S1 to S6)</li> <li>Excel spreadsheet with all image ratio and CPS data (Table S7)</li> <li>Iolite4 python plugin for virtual spot calculation (Iolite4_plugin_virtual_spot.py)</li> <li>Jupyter .ipynb file for U-Pb age calculation (Multiage.ipynb, R language)</li> <li>Jupyter .ipynb file for cp-sat minimum rectangle problem calculation (Rects.ipynb, Python language)</li> </ul>

opencc-by-nc-4.0Sep 2023View details →

CatVolc: A new database of geochemical and geochronological data of volcanic-related materials from the Catalan Volcanic Zone (Spain)

The Catalan Volcanic Zone (CVZ) (NE Spain) consists of an intraplate alkaline volcanic zone associated with the opening of the Western Mediterranean and the development of the European Rift System. Volcanic activity in the CVZ started in the L’Empordà area (ca. > 12 - 8 Ma), extended to La Selva (7.9 - 1.7 Ma), and finally migrated to the Garrotxa Volcanic Field (< 0.7 - 0.01Ma). Despite the scientific interest in the CVZ since the early 19th century, certain aspects remain poorly constrained. These include a full understanding of the spatial and temporal evolution of the magma plumbing system and ascent mechanisms, as well as the chronology of volcanism across the CVZ. Addressing these unresolved questions requires geochemical, petrological, and geochronological data, which, in the case of the CVZ, are scattered and have never been integrated or analyzed within a unified framework. Here, we present the CatVolc (Catalan Volcanism) database, which compiles available geochemical and geochronological data of volcanic-related materials of the CVZ.  For each sample, the CatVolc database lists general information about the sampling site, sample lithology, whole-rock analyses (including major and trace elements), isotopic ratios, mineral chemistry, and radiometric/thermoluminescence dating information, if available. A preliminary analysis of the information contained in the CatVolc database highlights the critical limitations of the current state of knowledge and allows suggesting potential future directions for volcanic-driven investigations in the CVZ. Additionally, the results obtained validate the CatVolc database as a key tool for comprehending the spatial and temporal evolution of the magmatic system(s) and volcanic activity in the CVZ, particularly in the Garrotxa Volcanic Field. This aspect is critical for advancing in the assessment of the volcanic hazards in the region and for gaining a comprehensive understanding of future volcanic activity. The current database version consists of three MS Excel files dedicated to primary magmatic rocks (CatVolc_magmatic_rocks.xlsx), xenoliths (CatVolc_xenoliths.xlsx) and radiometric/thermoluminescence dating information (CatVolc_dating.xlsx). Each MS Excel file is structured around a main table (Samples_general_info) containing general information (e.g., location, age, sampling site) of the listed samples, and a certain number of secondary tables.  Secondary tables included in the MS Excel files for magmatic rocks and xenoliths report: (i) whole-rock geochemistry (Major_elements and Trace_elements); (ii) isotopic relations data (Isotopic_relations); and (iii) mineral and volcanic glass chemistry (Amphibole, Feldspar, Felspathoid, Glass, Mica, Olivine, Pyroxene, Oxides, Serpentines and Sulphides). In addition to the Samples_general_info table, the CatVolc_dating.xlsx also includes radiometric/thermoluminescence dating information (Dating). Finally, in all three Excel files, we have incorporated a table with consulted references (References) and a glossary of the acronyms used for the parameters included in the main and secondary tables (Codes).

opencc-by-4.0Sep 2024View details →

Calcite U-Pb geochronology and paleomagnetism reveal Mesozoic multi-episodic remagnetizations from the Penglaitan GSSP section, South China

The Supplementary S1 includes: Supplemental Figure S1-4 and Tables S1. The Supplementary S2 is the raw data of in-situ calcite U-Pb dating.

opencc-by-4.0Dec 2021View details →

Text-fig. 4. Porechye open pit coal mine. a: photography of the Lipovtsy Formation section; b: stratigraphic column, 1 – sandstone, 2 – conglomerate, 3 – coal, 4 – tuff dated by U-Th-Pb geochronology, 5 – siltstone, 6 – mudstone, 7 – palynological samples with angiosperm pollen, 8 – dispersed angiosperm cuticles. in Angiosperm Diversification In The Early Cretaceous Of Primorye, Far East Of Russia

Text-fig. 4. Porechye open pit coal mine. a: photography of the Lipovtsy Formation section; b: stratigraphic column, 1 – sandstone, 2 – conglomerate, 3 – coal, 4 – tuff dated by U-Th-Pb geochronology, 5 – siltstone, 6 – mudstone, 7 – palynological samples with angiosperm pollen, 8 – dispersed angiosperm cuticles.

opencc-by-4.0Dec 2020View details →

FIGURE 1. 1.1 in Geochronology of the middle Eocene Purple Bench locality (Devil's Graveyard Formation), Trans-Pecos Texas, USA

FIGURE 1. 1.1 Map of the Tornillo Basin (modified from Atchley et al., 2004 after Lehman, 1986). Star indicates location of the Devil's Graveyard Formation exposures examined in this study. 1.2. Stratigraphy of the Tornillo Basin and the related North American Land Mammal Ages. A.C.B. = Alamo Creek Basalt (Modified from Lehman, 1991).

opencc-by-4.0Dec 2020View details →

FIGURE 2 in Geochronology of the middle Eocene Purple Bench locality (Devil's Graveyard Formation), Trans-Pecos Texas, USA

FIGURE 2. Generalized stratigraphic column of the lower and middle members of the Devil's Graveyard Formation. Symbols denote detrital zircon sample locations and known fossil localities. X-axis represents erosional profile. Colors represent visual expression of outcrop correlating to paleosol type (Emery-Wetherell et al., 2016). Note that the detrital zircon U-Pb sample identifications listed at the far right do not stratigraphically coincide with the associated fossil localities, which are identified by the bone symbols.

Fig. 6 in Expanding the geographic and geochronologic range of early pinnipeds: New specimens of Enaliarctos from Northern California and Oregon

Fig. 6. Mandibles and vertebrae of pinniped mammal Enaliarctos sp. (UWBM 89114) from Moolack Beach, Lincoln County, Oregon, Astoria Formation, late early Miocene. Two sides of the block (A, B). Photographs (A1, B1), explanatory drawings (A2, B2). Abbreviations: CV, cervical vertebra; TV, thoracic vertebra.

Fig. 1 in Expanding the geographic and geochronologic range of early pinnipeds: New specimens of Enaliarctos from Northern California and Oregon

Fig. 1. Locality map for fossils of enaliarctines. Map of Oregon and California (A), the coastline near Newport, Oregon (B), the coastline near Point Arena, California (C).

Fig. 3 in Expanding the geographic and geochronologic range of early pinnipeds: New specimens of Enaliarctos from Northern California and Oregon

Fig. 3. Mandible of pinniped mammal Enaliarctos mealsi (UCMP 114474) from Schooner Gulch, Mendocino County, California, earliest Miocene; in lingual (A), occlusal (B), and labial (C) views.

Fig. 5 in Expanding the geographic and geochronologic range of early pinnipeds: New specimens of Enaliarctos from Northern California and Oregon

Fig. 5. Elements of pinniped mammal Enaliarctos sp., cf. E. tedfordi Berta, 1991 (UCMP 253400) from Ona Beach, Lincoln County, Oregon, Yaquina Formation, early late Oligocene; overview of original block (A), lingual (B), occlusal (C), and labial (D) views; matrix preserving impression of lingual side of p4 and m1 (E).

Fig. 8 in Expanding the geographic and geochronologic range of early pinnipeds: New specimens of Enaliarctos from Northern California and Oregon

Fig. 8. Time calibrated composite phylogenetic hypothesis of early pinnipedimorphs and putative allies, with an emphasis on Oligo-Miocene pinnipedimorphs from the eastern North Pacific. Topology based on Boessenecker and Churchill (2015), except as follows: Enaliarctos from Berta (1991); Phocoidea after Boessenecker and Churchill (in press). Placement of Pacificotaria from Deméré and Berta (2001), conjectural placement (dashed lines) of Puijila and Kolponomos after Tedford et al. (1994) and Rybczynski et al. (2009), Enaliarctos sp. (UWBM 89114) based on shared dental synapomorphies with E. emlongi and E. mitchelli. Geochronologic ranges from Table 3 (this study), Boessenecker and Churchill (2015: supplementary information, in press: supplementary information), and Rybczynski et al. (2009).

Fig. 4 in Expanding the geographic and geochronologic range of early pinnipeds: New specimens of Enaliarctos from Northern California and Oregon

Fig. 4. Metacarpal of pinniped mammal Enaliarctos mealsi Mitchell and Tedford, 1973 (UCMP 276804) from Schooner Gulch, Mendocino County, California, earliest Miocene; in dorsal (A), lateral (B), and ventral/palmar C) views.

Fig. 2 in Expanding the geographic and geochronologic range of early pinnipeds: New specimens of Enaliarctos from Northern California and Oregon

Fig. 2. Stratigraphic columns of Oregon (A) and California (B) localities. Columns based on Snavely et al. (1964) and Phillips et al. (1976); paleomagnetic and K/Ar dates from Prothero et al. (2001a, b) and Phillips et al. (1976). In the interest of clarity non-enaliarctine marine carnivores are omitted. Modified from Moore (1963) and Phillips et al. (1976). Abbreviations: FAD, first appearance datum; LAD, last appearance datum; t, type locality/horizon.

Fig. 6 in Paleontology and Geochronology of the Deseadan (late Oligocene) of Moquegua, Perú

Fig. 6. Comparative anatomy of dp4 and m1 of Sallamys spp. A, Right dp4 and m1 of S. quispea, sp. nov. (holotype, MUSM 1404), shown as a SEM micrograph (left) and a line drawing (right) to illustrate the terminology used in the text. (Terminology based on Patterson and Wood, 1982; and Candela, 1999: Abbreviations: hypf 5 hypoflexid; hyp-lophd 5 hypolophid; mesf 5 mesoflexid; post-lophid 5 posterolophid; prtcnd 5 protoconid.) B, is the right dp4 and m1 of PU 20909, Sallamys pascuali, in which the dp4 reflects the morphology of that of the holotype (Hoffstetter and Lavocat, 1970). C is a left dp4 and m1 (digitally reversed to appear as right) of Sallamys, cf. S. pascuali, UF 114458, in which the morphology of the dp4 is distinct from that of the holotype and referred specimen PU 20909 (see Patterson and Wood, 1982: fig. 5d, and text for discussion). Photo of PU 20909 º Yale Peabody Museum of Natural History, New Haven, Connecticut.

Fig. 3 in Paleontology and Geochronology of the Deseadan (late Oligocene) of Moquegua, Perú

Fig. 3. Ar age spectra for the Sugarloaf biotite of Cerro Pan de Azúcar. TFA 5 total fusion age; WMPA

Fig. 7. Moqueguahippus glycisma. A, MUSM 676 in Paleontology and Geochronology of the Deseadan (late Oligocene) of Moquegua, Perú

Fig. 7. Moqueguahippus glycisma. A, MUSM 676, (left) left rostrum with I2-3, dC, C, dP1 and P2; (right) close up of dentition; and MUSM 964: B, left astragalus in (clockwise) dorsal, lateral, distal, and plantar views; C, right unciform in dorsal and distal views; and D, two manual ungual phalanges in dorsal view.

Fig. 5 in Paleontology and Geochronology of the Deseadan (late Oligocene) of Moquegua, Perú

Fig. 5. Holotype of Sallamys quispea, MUSM 1404. Micrographs provide views from four perspectives (occlusal [A], lateral [B], medial [C], and medial oblique [D]) as well as close ups of the occlusal surfaces of m1 (E) and dp4 (F).

Fig. 1 in Paleontology and Geochronology of the Deseadan (late Oligocene) of Moquegua, Perú

Fig. 1. Geologic map of the fossil localities of the upper Moquegua Formation. Based on: Bellido, E. and C. Guevara. 1961 (Mapa Geológico del Cuadrángulo de Clemensí, Carta Geológica Nacional y Instituto Geográfico Militar); Shockey et al., 2006: fig 1; and satellite images from Google Earth. Trachytheriine localities of Bolivia are indicated in insert map at upper right: Salla (Trachytherus alloxus); A, Lacayani (T. spegazzinianus); and B, Río Iru Pluma (T. subandinus).

Fig. 8. Trachytheriine autopodia. A in Paleontology and Geochronology of the Deseadan (late Oligocene) of Moquegua, Perú

Fig. 8. Trachytheriine autopodia. A, Nearly complete right manus of cf. Trachytherus spegazzinianus (MUSM 668); B, Carpal region of right manus of Trachytherus sp. (mid-sized species) (MUSM 963); C, right manus (missing digits and trapezoid) of trachytheriine, small indeterminate species, (MUSM 965); D, right pes (missing digits) cf. Trachytherus spegazzinanus of Moquegua (MUSM 668); E, line drawing of Trachytherus pes; and F, line drawing of Eutypotherium lehmannnitschei of Laguna Blanca, Chubut, Argentina (drawn from AMNH 14963, cast of a Museo de La Plata specimen).

Fig. 2 in Paleontology and Geochronology of the Deseadan (late Oligocene) of Moquegua, Perú

Fig. 2. Photo of the north face of the summit of Cerro Pan de Azúcar illustrating the lower region of the upper Moquegua Formation, including the Sugarloaf ash. (The boundary between the lower and upper Moquegua Formation is covered at this locale.) Note crew members hiking up the slopes for an impression of scale.