EN | The Paranapanema block constitutes an important piece in paleogeographical reconstructions. However, few direct information about it in the Southernmost Brasília orogen is available as the block has been covered since the Cretaceous by the Parana basin. Surprisingly, two very similar samples of Opx-Cpx-Hbl banded granulites separated by 5km have shown strongly different U-PbContinue reading “[Article] The missing piece of the Paranapanema block in the Guaxupé nappe (Southernmost Brasília orogen)”
Author Archives: petrochronics
[TST] Late-magmatic fluid induced alteration in the Itaporé batholith rocks
EN | Late-magmatic fluid induced alteration is outstandingly marked in the Itaporé batholith rocks: This evolution in the alteration degree is evidenced by siderophyllite (Bt) to phengite (Ph) to muscovite (Ms) transitions. The intense degree of alteration in the two-mica granite (a) and the muscovite leucogranite (b) result in a significant deviation from the parentalContinue reading “[TST] Late-magmatic fluid induced alteration in the Itaporé batholith rocks”
[Article] Structural Evolution of a 1.6 Ga Orogeny Related to the Final Assembly of the Supercontinent Nuna: Coupling of Episodic and Progressive Deformation
EN | In this contribution a multiscale structural and microstructural approach is applied to unravel the tectono-metamorphic history of a Proterozoic orogenic belt in NE Australia related to the 1.6 Ga assembly of the supercontinent Nuna. Three main deformation stages and associated composite fabrics were identified in the Georgetown Inlier in NE Australia. Coupling ofContinue reading “[Article] Structural Evolution of a 1.6 Ga Orogeny Related to the Final Assembly of the Supercontinent Nuna: Coupling of Episodic and Progressive Deformation”
PETROCHRONICS 