Proterozoic low-Ti iron-oxide deposits in New York and New Jersey: relation to Fe-oxide (Cu-U-Au-rare earth element) deposits and tectonic implications: comment and reply
Article Abstract:
James M. McLelland and Michael P. Foose's 1995 work 'Proterozoic low-Ti iron-oxide deposits in New York and New Jersey: relation to Fe-oxide (Cu-U-Au-rare earth element) deposits and tectonic implications' classified the low-Ti magnetite bodies in the Adirondacks and Reading Prong-Hudson Highlands as Olympic Dam-type deposits. However, certain features of the deposits suggest that the iron's emplacement took place before the main Grenville deformation and metamorphism. This proves a non-relation to late tectonic granitoid emplacement as implied by McLelland and Foose.
Publication Name: Geology
Subject: Earth sciences
ISSN: 0091-7613
Year: 1996
User Contributions:
Comment about this article or add new information about this topic:
Mono-sample Pb-Pb dating of pyrrhotite and tourmaline: Proterozoic vs. Archean intracratonic gold mineralization: comment and reply
Article Abstract:
The theory that the combined pyrrhotite-arsenopyrite-quartz isochron age represents the age of gold mineralization is faulty because pyrrhotite undergoes re-equilibration at a rapid rate even at low temperatures. Hence, isotopic resetting should be expected in all samples of such minerals, except for the most pristine, of possible Archean age to mimic a Proterozoic mineralization age. Also, gold mineralization may have commenced during the Proterozoic age or that Archean-age mineralization simply underwent isotopic resetting in the Proterozoic era.
Publication Name: Geology
Subject: Earth sciences
ISSN: 0091-7613
Year: 1997
User Contributions:
Comment about this article or add new information about this topic:
Rhinns complex: a missing link in the Proterozoic basement of the North Atlantic region
Article Abstract:
Paleoproterozoic basement has recently been discovered on islands in western Scotland and north Ireland. Called the Rhinns complex, it is composed of deformed alkalic igneous rock representing new crust derived from the mantle at ca 1.8 Ga. This complex may be associated with the southern portion of the Laurentia-Baltica supercontinent, remains of which form the continental crust of North America, Greenland and Scandinavia.
Publication Name: Geology
Subject: Earth sciences
ISSN: 0091-7613
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Two-decked nature of the Ouachita Mountains, Arkansas. Protorezoic low-Ti iron-oxide deposits in New York and New Jersey: relation to Fe-oxide (Cu-U-Au-rare earth element) deposits and tectonic implications: comment and reply
- Abstracts: Extrusion of the Altyn Tagh wedge: a kinematic model for the Altyn Tagh fault and palinspastic reconstruction of northern China: comment and reply
- Abstracts: Carbonate-periplatform sedimentation by density flows: a mechanism for rapid off-bank and vertical transport of shallow-water fines: comment and reply
- Abstracts: Extending the western North American Proterozoic and Paleozoic continental crust through the Mojave Desert: comment and reply