Results 111 to 120 of about 39,183 (233)

Speculations on nature and extent of Archean basement in Labrador as indicated by SR, ND and PB isotopic systematics of proterozoic intrusives [PDF]

The Sm-Nd and Rb-Sr isotopic compositions of mid to late Proterozoic (approximately 1.6 to 1.1 Ga) massif-type anorthosites and mafic intrusives in the eastern Canadian shield are correlated with geographic location.
Ashwal, L. D., Emslie, R. F., Wooden, J. L.   +2 more
core   +1 more source

The Wisconsin magmatic terrane: An Early Proterozoic greenstone-granite terrane formed by plate tectonic processes [PDF]

The Wisconsin magmatic terrane (WMT) is an east trending belt of dominantly volcanic-plutonic complexes of Early Proterozoic age (approx. 1850 m.y.) that lies to the south of the Archean rocks and Early Proterozoic epicratonic sequence (Marquette Range ...
Laberge, G. L., Schulz, K. J.
core   +1 more source

Marine Aluminum Phosphate–Sulfate Authigenesis as a Phosphorus Sink During Mid‐Proterozoic Oxygenation

Geophysical Research Letters
Enhanced continental phosphorus input into the ocean has been suggested as a potential trigger for the transient oxygenation events during the mid‐Proterozoic; however, the response of phosphorus cycling to these marine oxygenations remains unclear. Here,
Baozeng Xie, Maxwell Lechte, Xiaoying Shi, Xi Wang, Limin Zhou, Xiqiang Zhou, Kang‐Jun Huang, Zhenfei Wang, Xinqiang Wang, Dongjie Tang   +9 more
doaj   +1 more source

Mobilization of the platinum group elements by low-temperature fluids: Implications for mineralization and the iridium controversy [PDF]

Geochemical investigations on the widely dispersed Late Proterozoic Acraman impact ejecta horizon and its host marine shales in the Adelaide Geosyncline provide strong evidence for low-temperature mobilization of the platinum group elements (PGE ...
Dowling, Kim, Gostin, Victor A., Keays, Reid R., Wallace, Malcolm W.   +3 more
core   +1 more source

Early Archean tonalite gneiss in the upper peninsula of Michigan [PDF]

Geochronological results on tonalite gneiss of northern Michigan that is 3.56 Ga or slightly older is presented. Tonalitic augen gneiss and structurally overlying biotite gneiss and schist are exposed in a dome near Watersmeet.
Peterman, Z. E., Sims, P. K., Zartman, R. E.   +2 more
core   +1 more source

Evaluation of potential helium source rocks and helium enrichment factors in coalbed methane in the eastern margin of Ordos basin. [PDF]

Sci Rep
Chen Y, Tao S, Kang R, Gao J, Yang Y, Fang X, Song W, Chen Y, Liu X.   +8 more
europepmc   +1 more source

Geochemical Characteristics of Meso-Neoproterozoic-Cambrian Potential Shale Source Rocks and Oil Source Correlation for Paleo-Reservoirs in the Cambrian Formations of the Zhongtiaoshan Area in Southern East of the Ordos Basin. [PDF]

ACS Omega
Liu H, Li C, Feng S, Ma G, Chen X, Huang X.   +5 more
europepmc   +1 more source

The relationship between natural hydrogen flow rates and production viability. [PDF]

Sci Rep
Franke D, Klitzke P, Bagge M, Lutz R, Ostertag-Henning C, Blumenberg M, Thiel C, Bahr A.   +7 more
europepmc   +1 more source

Metamorphism of the Oddanchatram anorthosite, Tamil Nadu, South India [PDF]

The Oddanchatram anorthosite is located in the Madurai District of Tamil Nadu, near the town of Palni. It is emplaced into a granulite facies terrain commonly presumed to have undergone its last regional metamorphism in the late Archean about 2600 m.y ...
Janardhan, A. S., Wiebe, R. A.
core   +1 more source

A mantle assist for the early geodynamo and planetary shielding. [PDF]

Natl Sci Rev
Tarduno JA.
europepmc   +1 more source