Results 61 to 70 of about 8,820 (215)

Stratigraphy, petrography and tectonics of the manganese-bearing Buritirama Formation, Northern Carajás Domain, Amazon Craton

Brazilian Journal of Geology, 2019
The Buritirama Formation (BF) occurs at the extreme north of the Carajás Province, close to the contact with the Bacajá domain, in the southeastern portion of the Amazon Craton (Brazil). The BF consists of a 40 km long, ca.
Silas Santos Salgado, Fabrício de Andrade Caxito, Glaucia Nascimento Queiroga, Marco Paulo de Castro   +3 more
doaj   +1 more source

Investigating Layered Cratonic Lithosphere in the Fennoscandian Shield

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 9, September 2026.
Abstract Cold, thick, and chemically depleted lithosphere with high seismic velocity and low attenuation characterizes continental cratons. However, discrepancies between xenolith‐based thermal constraints and those inferred from surface‐wave seismic models, together with the widespread observation of mid‐lithosphere discontinuities, challenge the ...
Yiran Huang, Colleen A. Dalton, Karen M. Fischer   +2 more
wiley   +1 more source

Paleoproterozoic lithotectonic divisions of the southeastern Churchill Province, western Labrador

, 1996
The southeastern Churchill Province (SECP) is a Paleoproterozoic system of orogens that formed during collision of the Nain and Superior cratons with a composite lithotectonic terrane that now forms the medial, metamorphic–plutonic core zone of the SECP.
G. J. Kilfoil, H. A. Wasteneys, D. T. James, J. N. Connelly   +3 more
core   +1 more source

Porous and Permeable Crystalline Basement: Evidence for Large‐Scale Hydraulic Connectivity at Kivetty, Finland

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 9, September 2026.
Abstract Porosity and permeability in crystalline shield basement are commonly assumed to be low, yet some fault zones sustain fluid circulation over kilometer scales. Here we quantify multiscale fault‐zone connectivity at Kivetty, central Finland, by integrating legacy deep‐borehole data, including packer tests, downhole logs, and a long‐term multi ...
Daniel Carbajal‐Martínez, Michael J. Heap, Ester M. Jolis, Toni Luoto, Thierry Reuschlé, Satu Vuoriainen, Jukka Kuva, Evgenii Kortunov, Alan Bischoff   +8 more
wiley   +1 more source

Siberian craton - a fragment of a Paleoproterozoic supercontinent [PDF]

Russian Journal of Earth Sciences, 2002
The sialic (volcanogenic) material of the terranes in 3the Siberian fragment of a Paleoproterozoic supercontinent separated from the mantle 3.5, 3.3, 3.0, and 2.5 billion years ago. The collision zones (sutures) between the terranes are dated by granitoids which melted from the crust of the terranes in two periods of time: 1.9 and 1.8 billion years ago.
openaire   +1 more source

Crustal Evolution of the Himalaya since Paleoproterozoic

, 2022
Understanding the crustal evolution of any orogen is essential in delineating the nomenclature of litho units, stratigraphic growth, tectonic evolution, and, most importantly, deciphering the paleogeography of the Earth. In this context, the Himalayas, one of the youngest continent-continent collisional orogen on the Earth, has played a key role in ...
Vikas Adlakha, Kalachand Sain
openaire   +1 more source

Why Does the Broken Hill Deposit Sit in Resistive Crust? Magnetotelluric Evidence for Metamorphic Decoupling of a World‐Class Mineral System

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 9, September 2026.
Abstract The spatial association between electrical conductors and ore deposits underpins the widespread use of magnetotellurics (MT) in mineral exploration, yet not all mineral systems preserve a diagnostic conductive signature. Here, we present a high‐resolution MT study of the region hosting the world‐class Broken Hill Pb‐Zn‐Ag deposit (NSW ...
Yahya AlQahtani, Sinan Özaydın, Vasileios Chatzaras, Patrice F. Rey, Tiago Passos   +4 more
wiley   +1 more source

Paleoproterozoic molassoid complexes of SW Chana

Moscow University Bulletin. Series 4. Geology, 2016
Based on a study of modern-day published evidences and own data the lithology, conditions of sedimentations, tectonic evolution and mineralization of molassoid complexes of SW Ghana which filled Tarkwa and Bui basins within the Birrimian paleoproterozoic orogenic belt are considered.
N. A. Bozhko, T. K. Adu, M. Yu. Kravtsova   +2 more
openaire   +2 more sources

Age and tectonic implications of Paleoproterozoic granitoid intrusions within the Nain Province near Nain, Labrador

, 1999
U-Pb (zircon) age determinations from three granitoid intrusions in the Nain region, formerly assigned to the well-known 1.35-1.29 Ga (Mesoproterozoic) Nain Plutonic Suite (NPS), indicate that they were emplaced, instead, during the Paleoproterozoic ...
A Bruce Ryan, James N Connelly
core   +1 more source

AGE AND PETROGENESIS OF DOLERITES ON THE MARA RIVER (SAYAN MARGINAL UPLIFT OF THE BASEMENT, SOUTHERN PART OF THE SIBERIAN CRATON)

Геодинамика и тектонофизика
This work focuses on petrological-and-geochemical features, as well as age of dolerites widespread within the basins of the Mara, Kamenka and Uvat rivers.
I. А. Izbrodin, А. G. Doroshkevich, А. B. Kotov, Е. B. Salnikova, А. E. Izokh, Е. F. Letnikova, А. V. Ivanov   +6 more
doaj   +1 more source