Pierpaolo Guarnieri

Geological Survey of Denmark and Greenland

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Thorkild M. Rasmussen

Luleå University of Technology

Anaïs Brethes

Luleå University of Technology

Anett Blischke

Iceland GeoSurvey

Erik Vest Sørensen

Geological Survey of Denmark and Greenland

ÖE

Ögmundur Erlendsson

Iceland GeoSurvey

Tobias Bauer

Luleå University of Technology

Diogo Rosa

Geological Survey of Denmark and Greenland

Henrik Nøhr‐Hansen

Geological Survey of Denmark and Greenland

Kristian Svennevig

Geological Survey of Denmark and Greenland

Rikke Weibel

Geological Survey of Denmark and Greenland

Cooperative Institutions

University of Florence

393

Ospedale di Livorno

160

Terra

157

Cambridge University Press

Infinera (United States)

Geological Survey of Denmark and Greenland

University of Copenhagen

National Research Council

Geocenter Denmark

University of Belgrade

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3D-Modelling of the Early Triassic Base-Metal Mineralized Syn-Rift Sequence in the Jameson Land Basin (East Greenland)

Anaïs Brethes Pierpaolo Guarnieri Thorkild M. Rasmussen Tobias Bauer

The Jameson Land Basin in central East Greenland is mineralized in Pb, Zn and Cu. Mineralization occurs in several stratigraphic horizons and along structures in Upper Permian and Triassic sediment ...

Sequence (biology)

Base metal

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The Black Angel deposit, Greenland: a Paleoproterozoic evaporite-related Mississippi Valley-type Zn–Pb deposit

Mineralium Deposita (2022)

Diogo Rosa David N. Leach Pierpaolo Guarnieri Andrey Bekker

Abstract The Paleoproterozoic Mârmorilik Formation in the Karrat basin of West Greenland hosts the Black Angel Zn–Pb deposit. Chlorine-rich scapolite, zones with vuggy porosity and quartz nodules in the ore-bearing marble are herein interpreted to represent metamorphosed, vanished, and replaced evaporites, respectively. Mineralization is closely associated with anhydrite with δ 34 S values (5.2–12.6‰) broadly comparable to published values for Paleoproterozoic seawater sulfate. Considering the fundamental attributes of the mineralization and host sequence, a Mississippi Valley-type (MVT) model is the most obvious explanation for mineralization. Overlying the ore-bearing sequence are organic-rich semipelites and massive calcitic marbles, which may have served as seals for hydrocarbon or reduced sulfur and acted as chemical traps for deposition of the sulfidic ore. The Mârmorilik Formation contained an interlayered sulfate-rich evaporite-carbonate sequence, a common setting for MVT deposits in the late Neoproterozoic and Phanerozoic, but unique among the few known MVT deposits in the Paleoproterozoic. This ca. 1915 Ma evaporite-carbonate platform is younger than sulfate evaporites deposited during and immediately after the ca. 2220–2060 Ma Lomagundi carbon isotope excursion and records a significant seawater sulfate level during a time interval when it was assumed that it had been too low to form extensive evaporite deposits. Therefore, MVT and clastic-dominated (CD) Zn–Pb deposits in the geological record might progressively fill the apparent gap in marine sulfate evaporites and provide unique insights into Proterozoic seawater sulfate level. Considering the sequence of tectonic events that affected the Karrat basin, the mineralization took place between Nagssugtoqidian collision (< 1860 Ma) and Rinkian metamorphism (ca. 1830 Ma).

Anhydrite

δ34S

10.1007/s00126-022-01125-z

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Reconstructing the Paleoproterozoic Heart of Nuna, from Fennoscandia to Northeastern Laurentia

Geological Society London Special Publications (2023)

Stephen T. Johnston Raimo Lahtinen B M Saumur Pierpaolo Guarnieri

Abstract Accurate palaeogeographical reconstructions of past supercontinents are necessary to test models of supercontinent cyclicity, secular variation in plate tectonics and mantle geodynamics. However, numerous factors limit our ability to reconstruct past supercontinents as is evident in the ongoing debates regarding the construction phase and geometry of Earth's most recent supercontinent, late Paleozoic to early Mesozoic Pangaea. An important factor in these debates, and a focus of our study is how best to palinspastically restore, in section and in plan-view, the orogenic belts along which supercontinents were stitched together. We utilize the orogenic belts spanning Baffin Island, Greenland and Fennoscandia that are inferred to record the assembly of the Paleoproterozoic supercontinent Columbia to test the accepted reconstruction of the Nuna core of Columbia. We show that as reconstructed in the Nuna model, each of Baffin Island, Greenland (with some complications) and Fennoscandia are characterized by an older cratonic backstop that gives way to younger accretionary complexes toward the inferred oceanic domain that lay to the south and which is inferred to have closed by subduction beneath northeastern Laurentia–Fennoscandia during Columbia assembly. This southward transition from cratonic backstop to accretionary orogen is a hallmark of upper plates in modern convergent plate margins and is consistent with the construction of the Columbia supercontinent, including its Nuna core, through plate tectonic processes, and provides a broad validation of the Nuna reconstruction and hence for Columbia as a whole. Map view curvature of the cratonic backstops is restricted to long wavelength, open bends consistent with the Archean crust having been characterized by significant lithospheric strength. The more accretionary southern portions of Nuna are, however, characterized by sinuous orogens that developed by oroclinal bending of formerly more linear belts, significantly complicating their palinspastic restoration and rendering detailed correlation of juvenile orogenic belts across Nuna problematic.

Supercontinent

Laurentia

Mountain formation

Laurasia

10.1144/sp542-2023-37

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The project CRUSMID-3D

Thorkild M. Rasmussen Pierpaolo Guarnieri Anaïs Brethes Anett Blischke Ögmundur Erlendsson

10.6027/9789289348027-3-en

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Drill-core data

Thorkild M. Rasmussen Pierpaolo Guarnieri Anaïs Brethes Anett Blischke Ögmundur Erlendsson

10.6027/9789289348027-8-en

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Review of Survey activities 2009: Study of a Palaeogene intrabasaltic sedimentary unit in southern East Greenland: from 3-D photogeology to micropetrography

DOAJ (DOAJ: Directory of Open Access Journals) (2010)

Henrik Vosgerau Pierpaolo Guarnieri Rikke Weibel Michael Larsen Cliona Dennehy

Paleogene

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Paleoseismic Investigation of Historical Liquefactions Along the Ionian Coast of Sicily

Journal of Earthquake Engineering (2008)

Pierpaolo Guarnieri Claudia Pirrotta Maria Serafina Barbano Paolo Martini D. Pantosti

Eastern Sicily is an area where some of the most catastrophic earthquakes in Italian history occurred. As reported by historical sources, these earthquakes induced liquefaction phenomena. In two areas along the Ionian coast of Sicily we found liquefaction evidence in Holocene deposits. In the Minissale site (east of Mount Etna), the observed liquefaction features can be related to the 1169 and 1693 earthquakes, while in the Agnone site (south of Catania), the deformational structures can be tentatively associated to the 1542 and 1693 events. Both sites locate in areas where historical liquefaction has been observed in the past, thus confirming the actual liquefaction susceptibility/potential in this region. The evidence of repeated liquefaction events at the same site, highlights the relevance of the paleoseismic approach for modeling the recurrence time and preparing scenarios of seismic effects in eastern Sicily, where seismogenic sources are scantly defined.

10.1080/13632460802212030

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Nature and Origin of a Massive Sulfide Occurrence in the Karrat Group: Evidence for Paleoproterozoic VMS Mineralization in Central West Greenland

Economic Geology (2023)

Y.M. DeWolfe Jochen Kolb Erik Vest Sørensen Diogo Rosa Pierpaolo Guarnieri

Abstract Mafic volcanic rocks of the Kangilleq Formation of the Paleoproterozoic Karrat Group host volcanogenic massive sulfide (VMS) mineralization in the area of central Kangiusap Kuua, central West Greenland. The mafic volcanic rocks display evidence of subaqueous, effusive eruption and redeposition by mass debris flows generated along fault scarps on the sea floor. A zone of semiconformable quartz alteration and disconformable chlorite alteration within hydrothermal breccias and mafic tuff breccias near the top of the volcanic sequence is interpreted to reflect a synvolcanic hydrothermal system. Conformable, massive to semimassive, and discordant, stringer-style sulfide mineralization is hosted within the quartz- and chlorite-altered volcanic rocks. The massive to semimassive sulfide mineralization is ~10 m thick and crops out along strike for ~2,000 m. The stringer zone is ≤10 m thick with individual sulfide stringers ranging in width from 5 to 90 cm. All sulfide zones are dominated by coarse pyrrhotite and pyrite, with trace amounts of sphalerite and chalcopyrite. The pillow lavas are subalkaline with geochemical characteristics typical of modern transitional to tholeiitic mid-ocean ridge or back-arc basin basalt. Trace element and Nd isotope data suggest that these lavas erupted in an epicratonic, back-arc basin. Characteristics of the host rocks indicate a period of localized rifting, volcanism, and VMS formation during genesis of the Karrat Group, which is dominated by siliciclastic rocks.

Breccia

Felsic

10.5382/econgeo.5036

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Citations (5)

Societal implications of the project CRUSMID-3D

Thorkild M. Rasmussen Pierpaolo Guarnieri Anaïs Brethes Anett Blischke Ögmundur Erlendsson

10.6027/9789289348027-18-en

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North Atlantic Permian–Triassic Syn- and Post-rift Plays - Analogues from East and Northeast Greenland

Proceedings (2018)

Gregers Dam J. Bojesen-Kofoed Morten Bjergager Pierpaolo Guarnieri Lars Stemmerik

Summary Good analogues are keys for better understanding petroleum systems in frontier basins and new plays in proven basins. Recent discoveries have proven Permian carbonate plays (e.g. 7120/1–3 and 7220/11-1) in the Norwegian Barents Sea and Triassic siliciclastic plays (e.g. Goliat, Tornerose and Alke Sør) in the North Atlantic. Permian and Triassic plays have been unsuccessfully tested on the Mid-Norwegian continental shelf (M-NCS), but these plays have recently attracted renewed attention. However, the lack of offshore core data from this interval provides a major obstacle in developing valid play models. On the conjugate East and Northeast Greenland margin, excellent outcrops and a large number of shallow fully cored boreholes document the syn- to post-rift Permian–Triassic interval. Data from this interval in East and Northeast Greenland thus provide important constrains on key elements for new play models on the M-NCS. The presentation will provide observations from East and Northeast Greenland that may help to assist the definition of play models for the Permian–Triassic succession in the M-NCS and place them in a tectono-stratigraphic context.

Outcrop

Geosyncline

Carbonate platform

10.3997/2214-4609.201801497

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