Results 51 to 60 of about 1,268,035 (217)

Statistical physics and stromatolite growth: new perspectives on an ancient dilemma

open access: yes, 2004
This paper outlines our recent attempts to model the growth and form of microbialites from the perspective of the statistical physics of evolving surfaces. Microbialites arise from the environmental interactions of microbial communities (microbial mats).
Arp   +25 more
core   +1 more source

Gigantism in unique biogenic magnetite at the Paleocene-Eocene Thermal Maximum [PDF]

open access: yes, 2008
We report the discovery of exceptionally large biogenic magnetite crystals in clay-rich sediments spanning the Paleocene-Eocene Thermal Maximum (PETM) in a borehole at Ancora, New Jersey. Aside from previously-described abundant bacterial magnetofossils,
Guerquin-Kern, Jean-Luc   +12 more
core   +2 more sources

The Geologic Features of the Occurrence of Copper in North America [PDF]

open access: yes, 1933
Copper is of such widespread natural occurrence in North America and there are so few metal-mining districts that have not contributed to its production that it is obviously necessary in any brief general treatment of the geology of the copper deposits ...
Ransome, F. L.
core  

Investigation on type and origin of iron mineralization at Mesgar occurrence, south of Zanjan, using petrological, mineralogical and geochemical data

open access: yesJournal of Economic Geology, 2015
Introduction Mesgar iron occurrence is located in northwestern part of the Central Iran, 115 km south of Zanjan. Although there is a sequence of volcanic-pyroclastic rocks accompanied by iron mineralization, no detailed works had been conducted in the ...
Mohammad Ebrahimi   +2 more
doaj  

Mass wasting at the base of the South central Chilean continental margin: the Reloca Slide [PDF]

open access: yes, 2009
Offshore south central Chile (35° S–42° S), the morphology of the lowermost continental slope and trench floor witnesses a voluminous submarine mass-wasting event.
Behrmann, Jan Hinrich   +4 more
core   +1 more source

Axiology of Life Experience: 20th-21st Centuries in the Prism of the Fate of a Titled Russian Nobleman

open access: yesКонцепт: философия, религия, культура
The biography genre was initially focused on the life stories of great people, kings and generals who decided the fate of countries and peoples. However, as the culture of memory became more democratized and numerous archives, documents, diaries, etc ...
V. S. Glagolev
doaj   +1 more source

Types and characteristics of vulnerable eco-geological environments on the Yunnan plateau and countermeasures for ecological restoration

open access: yesCarsologica Sinica
The geological background of the Yunnan plateau in the study area is complex, with significant uplift caused by the Himalayan orogeny, intense neotectonic movements, and pronounced variations in fault block elevation.
Qin LI   +4 more
doaj   +1 more source

Optical Mineralogy [PDF]

open access: yes, 1997
This resource is a 43 page pdf document on the principals of optical mineralogy. Topics include light, the polarizing light microscope, the refractive index, optical classes and indicatrix theory, the relationship of optical properties to crystal ...
Mickey Gunter
core  

Eastern Beringia and beyond: Late Wisconsinan and Holocene landscape dynamics along the Yukon Coastal Plain, Canada [PDF]

open access: yes, 2012
Terrestrial permafrost archives along the Yukon Coastal Plain (northwest Canada) have recorded landscape development and environmental change since the Late Wisconsinan at the interface of unglaciated Beringia (i.e.
Fritz, Michael   +6 more
core   +1 more source

Home - About - Disclaimer - Privacy