Search Results - "Vasconcelos, Paulo M"

(U–Th)/He geochronology of goethite and the origin and evolution of cangas by Monteiro, Hevelyn S., Vasconcelos, Paulo M., Farley, Kenneth A., Spier, Carlos A., Mello, Claudio L.

“…(U–Th)/He geochronology of 147 grains of goethite cements extracted from ferruginous duricrusts (cangas) developed on banded iron-formations from the…”
Get full text

Microbial Diversity in Actively Forming Iron Oxides from Weathered Banded Iron Formation Systems by Gagen, Emma J., Levett, Alan, Shuster, Jeremiah, Fortin, Danielle, Vasconcelos, Paulo M., Southam, Gordon

“…The surface crust that caps highly weathered banded iron formations (BIFs) supports a unique ecosystem that is a post-mining restoration priority in iron ore…”
Get full text

Accelerating microbial iron cycling promotes re‐cementation of surface crusts in iron ore regions by Gagen, Emma J., Levett, Alan, Paz, Anat, Bostelmann, Heike, Valadares, Rafael Borges da Silva, Bitencourt, José Augusto Pires, Gastauer, Markus, Nunes, Gisele Lopes, Oliveira, Guilherme, Vasconcelos, Paulo M., Tyson, Gene W., Southam, Gordon

“…We promoted microbial iron reduction and subsequent iron oxidation, in crushed iron‐rich mine waste at pilot scale (~1 m3). Repeated iron cycling led to the…”
Get full text

Biogeochemical cycling of iron: Implications for biocementation and slope stabilisation by Levett, Alan, Gagen, Emma J., Vasconcelos, Paulo M., Zhao, Yitian, Paz, Anat, Southam, Gordon

“…Microbial biofilms growing in iron-rich seeps surrounding Lake Violão, Carajás, Brazil serve as a superb natural system to study the role of iron cycling in…”
Get full text

Biocement stabilization of an experimental-scale artificial slope and the reformation of iron-rich crusts by Levett, Alan, Gagen, Emma J., Zhao, Yitian, Vasconcelos, Paulo M., Southam, Gordon

“…Novel biotechnologies are required to remediate iron ore mines and address the increasing number of tailings (mine waste) dam collapses worldwide. In this…”
Get full text

Goethite (U–Th)/He geochronology and precipitation mechanisms during weathering of basalts by Riffel, Silvana B., Vasconcelos, Paulo M., Carmo, Isabela O., Farley, Kenneth A.

“…(U–Th)/He geochronology of 33 goethite grains from in situ ferruginous duricrusts overlying the Paraná flood basalt in the Guarapuava region, Paraná, Brazil,…”
Get full text

A new model of bauxitization in quartzitic landscapes: A case study from the Southern Espinhaço Range (Brazil) by De Campos, Daniela S., Monteiro, Hevelyn S., Vasconcelos, Paulo M., Farley, Kenneth A., Silva, Alexandre Christófaro, Vidal‐Torrado, Pablo

“…Lithology plays a fundamental role in rock weathering and erosion, and in landscape evolution. When weathering‐ and erosion‐prone lithologies are protected…”
Get full text

Characterisation of iron oxide encrusted microbial fossils by Levett, Alan, Gagen, Emma J., Rintoul, Llew, Guagliardo, Paul, Diao, Hui, Vasconcelos, Paulo M., Southam, Gordon

“…Robust methods for the characterisation of microbial biosignatures in geological matrices is critical for developing mineralogical biosignatures. Studying…”
Get full text

New single crystal 40Ar/39Ar ages improve time scale for deposition of the Omo Group, Omo-Turkana Basin, East Africa by McDougall, Ian, Brown, Francis H, Vasconcelos, Paulo M, Cohen, Benjamin E, Thiede, David S, Buchanan, Michael J

“…Six tuffaceous beds within the Omo Group of the Omo-Turkana Basin have been dated using the 40Ar/39Ar single crystal total fusion method on anorthoclase,…”
Get full text

40Ar/39Ar dating of supergene Mn-oxides from the Zunyi Mn deposit, Guizhou Plateau, SW China: Implications for chemical weathering and paleoclimatic evolution since the late Miocene by Deng, Xiao-Dong, Li, Jian-Wei, Vasconcelos, Paulo M.

“…40Ar/39Ar laser incremental heating analyses of potassium-bearing Mn-oxides from a weathering profile at the Zunyi manganese deposit, northern Guizhou Plateau,…”
Get full text

Age and structure of the Permian Brook Street Terrane, Takitimu Mountains, New Zealand by Campbell, Matthew J., Mortimer, Nick, Rosenbaum, Gideon, Allen, Charlotte M., Vasconcelos, Paulo M., Campbell, Hamish J.

“…We use a recently completed airborne magnetic and gamma-ray spectrometric survey, and new U/Pb and 40 Ar/ 39 Ar age determinations, to revise and clarify…”
Get full text

Late Jurassic to Early Cretaceous age of the Daqiao gold deposit, West Qinling Orogen, China: implications for regional metallogeny by Wu, Ya-Fei, Li, Jian-Wei, Evans, Katy, Vasconcelos, Paulo M., Thiede, David S., Fougerouse, Denis, Rempel, Kirsten

“…The West Qinling Orogen is endowed with more than 100 sediment-hosted gold deposits with an estimated resource of > 2000 t Au. Previous radiometric dating…”
Get full text

Eocene melting of subducting continental crust and early uplifting of central Tibet: Evidence from central-western Qiangtang high-K calc-alkaline andesites, dacites and rhyolites by Wang, Qiang, Wyman, Derek A., Xu, Jifeng, Dong, Yanhui, Vasconcelos, Paulo M., Pearson, N., Wan, Yusheng, Dong, Han, Li, Chaofeng, Yu, Yuanshan, Zhu, Tongxing, Feng, Xintao, Zhang, Qiyue, Zi, Feng, Chu, Zhuyin

“…Changes in oceanic O–Sr isotopic compositions and global cooling beginning in the Eocene are considered to have been caused by the uplift of the Tibetan…”
Get full text

Eocene north–south trending dikes in central Tibet: New constraints on the timing of east–west extension with implications for early plateau uplift? by Wang, Qiang, Wyman, Derek A., Li, Zheng-Xiang, Sun, Weidong, Chung, Sun-Lin, Vasconcelos, Paulo M., Zhang, Qiyue, Dong, Han, Yu, Yuanshan, Pearson, N., Qiu, Huanning, Zhu, Tongxing, Feng, Xintao

“…East–west extension has been a prominent feature of Cenozoic tectonics in central-southern Tibet, and the onset of this extension has been interpreted as…”
Get full text

Rapid change in drift of the Australian plate records collision with Ontong Java plateau by Knesel, Kurt M., Cohen, Benjamin E., Vasconcelos, Paulo M., Thiede, David S.

“…The advance of the Australian plate Earth's largest and thickest oceanic plateau, the Ontong Java plateau, is currently colliding with the Australian plate,…”
Get full text

Combined 40Ar/39Ar and (U–Th)/He geochronological constraints on long-term landscape evolution of the Second Paraná Plateau and its ruiniform surface features, Paraná, Brazil by Riffel, Silvana B., Vasconcelos, Paulo M., Carmo, Isabela O., Farley, Kenneth A.

“…Regional correlation of dated weathered land surfaces provides the necessary constraints to test long-term continental landscape evolution models, but major…”
Get full text

Tracking the Australian plate motion through the Cenozoic: Constraints from 40Ar/39Ar geochronology by Cohen, Benjamin E., Knesel, Kurt M., Vasconcelos, Paulo M., Schellart, Wouter P.

“…Here we use geochronology of Australian intraplate volcanoes to construct a high‐resolution plate‐velocity record and to explore how tectonic events in the…”
Get full text

The Ban Houayxai epithermal Au–Ag deposit in the Northern Lao PDR: Mineralization related to the Early Permian arc magmatism of the Truong Son Fold Belt by Manaka, Takayuki, Zaw, Khin, Meffre, Sebastien, Vasconcelos, Paulo M., Golding, Sue D.

“…The Ban Houayxai Au–Ag deposit is located in the Truong Son Fold Belt in the northern Lao PDR, mainland SE Asia. The deposit is hosted within an Early Permian…”
Get full text

Remagnetization of Pre‐Fan Sediments Offshore Sumatra: Alteration Associated With Seismogenic Diagenetic Strengthening by Yang, Tao, Petronotis, Katerina E., Acton, Gary D., Zhao, Xixi, Chemale, Farid, Vasconcelos, Paulo M.

“…Increases in temperature and pressure caused by rapid burial of sediments seaward of the Sumatra subduction zone have been hypothesized to trigger dehydration…”
Get full text

Dating constituent formation in soils to determine rates of soil processes: A review by Cornu, Sophie, Montagne, David, Vasconcelos, Paulo M.

“…Rates of soil processes are poorly known. One approach to determine them could be through the radiogenic isotopic dating of soil constituents. Such methods…”
Get full text