نتایج جستجو برای: sedimentary structures

تعداد نتایج: 464979  

2009
M. L. Becker

There is a great need for more precise absolute ages for sedimentary rocks. We have been actively involved in developing techniques to directly date sedimentary rocks, rather than using associated igneous rocks, or using relative dating techniques. Sedimentary phosphate nodules (i.e. coprolites) are ideal candidates for absolute dating of sedimentary rocks. Phosphates occur commonly within the ...

2005
Baoping Shi James N. Brune

Two-dimensional lattice particle models have been used to simulate dynamic thrust faulting and its effects on near-fault ground motions. The lattice particle modeling approach has been demonstrated as an efficient way to model the dynamic rupture phenomena observed from a foam rubber experiment on dipping faults. We constructed a 42 dipping fault model to simulate near-fault ground motions unde...

2016
Takeshige Ishiwa Yusuke Yokoyama Yosuke Miyairi Minoru Ikehara Stephen Obrochta

Low-latitude continental shelves, mixed siliciclastic–carbonate sedimentary systems, provide an understanding of sedimentary environments driven by paleoclimatological processes. The Bonaparte Gulf, northwestern Australian continental shelf, is among the widest in the world, ranging to 500 km, with shallow carbonate terraces and platforms that were exposed during periods of lower sea level. The...

ژورنال: ژئوفیزیک ایران 2015
Ali Moradzadeh

Magnetotelluric (MT) is a natural electromagnetic (EM) technique which is used for geothermal, petroleum, geotechnical, groundwater and mineral exploration. MT is also routinely used for mapping of deep subsurface structures. In this method, the measured regional complex impedance tensor (Z) is substantially distorted by any topographical feature or small-scale near-surface, three-dimensional (...

2008
Shilong Mei

In general, the conventional approach to structure study uses potential-field data, including aeromagnetic and gravity data, for detecting the basement structures, and geophysical well-log data (combined with seismic data when available) for interpreting the sedimentary cover structures. With respect to well-log data, the main approach is to interpret faults from isopach and structure-top conto...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2007
Celeste A Asikainen Sean F Werle

We discovered ferromanganese nodules that measure up to 46 cm in diameter with stromatolitic growth patterns in the western central near-shore portion of Second Connecticut Lake, Pittsburg, New Hampshire. They occur as four distinct morphotypes: irregular laminated convex plates that form concentric rings around a nucleating center ("domed-plate"), continuous pustular pavements that extend >10 ...

Journal: Geopersia 2019

Gardaneshir Pb–Zn deposit is hosted by dolomitic carbonates which is located in the SW Ardestan, central Iran. Ore body is stratabound type in this deposit. Primary ores in this type are composed of sphalerite, galena, barite and quartz with massive, banded, veined and disseminated structures. Evaluation of ore-grade at the Gardaneshir Pb-Zn deposit, based on chemical analysis which indicates a...

Journal: :caspian journal of enviromental sciences 0

mud volcanoes are defined as main elements of geological structures and ways through and within which buried argillaceous loose sediments and lithified rocks. the gharniaregh tappeh and naftelijeh mud volcanoes are the most attractive geomorphological phenomena in continental which appear along the eastern coast of the caspian sea. the naftelijeh mud volcano is more active than gharniaregh–tapp...

Journal: Desert 2019
A. R. Karbassi M. Maghrebi M. Sadrinasab R. Lak R. Noori

Long marine sedimentary cores can be effective in paleo-climate reconstruction. The present research aims at analyzing  the temporal variation of temperature as an important climate parameter and also variations in metal concentrations (As, Ba, Cd, Li, Mo, Mg, Mn, Na, Pb, Sr, Zn, Fe, Ca, Al) of two long sedimentary cores at the Persian Gulf back to the Holocene. The obtained results revealed th...

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