35 documents found, page 1 of 4

Pre-Mesoproterozoic crustal framework and Mesoproterozoic evolution of the SW A...

ABSTRACT: The southwestern Angolan Shield hosts the Earth's largest Mesoproterozoic massif-type anorthosite complex (up to 53,500 km(2)), the Kunene Complex (KC). This complex is the result of a long-lived (similar to 200 Ma) episodic emplacement of coalescent magmatic pulses. The recent acquisition of multidisciplinary data during the PLANAGEO project has significantly enhanced our understanding of the Precamb...

Pre-Mesoproterozoic crustal architecture and implications for the Mesoproterozo...

ABSTRACT: Several studies suggest the existence of multiple tectonic domains within the Angolan Shield [1], yet the Archaean to Palaeoproterozoic basement of SW Angola and NW Namibia remains largely unexplored. Similarly, distinct Mesoproterozoic (1534–1065 Ma) igneous suites are documented in the SW Angolan Shield, including the largest known gabbro-anorthosite complex (~42,500 km²), the Kunene Complex (KC), b...

Zircon U-Pb and Lu-Hf Constraints on the Paleo- to Mesoproterozoic Evolution of...

ABSTRACT: The crustal evolution of the Angolan Shield (AS) remains poorly constrained. To address this, we analysed U-Pb and Lu-Hf isotopes in detrital and igneous zircons to determine the age and provenance of extensive sedimentary strata in southwest Angola, and use them as a proxy for the Paleoproterozoic to Mesoproterozoic evolution of the southwest AS. Mesoproterozoic maximum depositional ages between 1334...

The influence of synorogenic extension on the crustal architecture of North Gon...

A new structural study of a D2–M2 tectono-thermal structure in SW Iberia (Ponte de Sor–Seda gneiss dome) characterized by a spatial distribution of telescoping isograds providing a record of Buchan-type metamorphic conditions is presented. It comprises an infrastructure made up of the lower gneiss unit (LGU) and the intermediate schist unit (ISU), separated by early D2 ductile extensional shear zones. The LGU a...

Zircon U-Pb and Lu-Hf isotopes reveal the crustal evolution of the SW Angolan S...

ABSTRACT: The crustal evolution of the Angolan Shield (AS) remains poorly constrained. To address this, we analysed U-Pb and Lu-Hf isotopes in detrital and igneous zircons to investigate the age and provenance of extensive sedimentary strata in southwestern Angola and use it as a proxy to gain insight into the Archean to Mesoproterozoic evolution of the region. Mesoproterozoic maximum depositional ages for the ...

Tracking hydrothermal events using zircon REE geochemistry from the Carajás Min...

Zircon geochemistry and geochronology are powerful tools in the study of multistage cratonic settings, yielding information on ages and distinguishing terranes. The Caraj´ as Mineral Province (CMP) SE of the Amazonian Craton is renowned for its complex tectonic evolution and notable mineral deposits endowment, such as the giant iron-oxide-copper-gold (IOCG)-type Sossego and Salobo. Tectonic, magmatic, metamorph...

Provenance of the Ediacaran Salinas Formation (Araçuaí Orogen, Brazil): Clues f...

Geochronological systematics of the Huayna Potosí, Zongo and Taquesi plutons, C...

Geocronologia U-Pb em zircão do granulito Barauana Guiana Central, Roraima

Robust U-Pb SHRIMP zircon ages of granitic plutons of the Cordillera Real of Bo...