The bulk of the comet 81P/Wild 2 (hereafter Wild 2) samples returned to Earth by the Stardust spacecraft appear to be weakly constructed mixtures of nanometer-scale grains, with occasional much larger (over 1 micrometer) ferromagnesian silicates, Fe-Ni sulfides, Fe-Ni metal, and accessory phases. The very wide range of olivine and low-Ca pyroxene compositions in comet Wild 2 requires a wide ran...

The siliceous shale oil and gas in Nadanhada terrane has been studied through field geological survey, geochemistry sedimentary petrology. results show that the area belongs to a good reservoir, rock is brittle suitable for exploitation. abundance of organic matter relatively high. From west east from south north, increases maturity decreases. dynamic metamorphism thermal contact rocks are grad...

Introduction: The HEDs make up the largest suite of crustal igneous rocks available from asteroids. Sili-cate clasts in the mesosiderite metal-silicate breccias are also dominated by crustal rocks that resemble the HEDs in many ways. Silicate petrology in both groups of meteorites range from strikingly similar fine-grained basalts to coarse grained orthopyroxenites. Mesosid-erites furthermore c...

Dynamic development of petrology leads to the intensification processes terms formation. The need organize system rocks and minerals names in Ukrainian language accordance with international standards, unify standardize it is becoming increasingly important. A number problems related functioning (and international) petrological terminology, including transcription national language, constant ch...

The inference of temporal information from past event occurrences is relevant in several applications for geological domains. In such applications, the order in which events have happened is imprinted in the domain as visualspatial relations among its elements. The interpretation of the relative ordering in which events have occurred is essential for understanding the geological evolution in di...

Planes of liquid inclusions are common in the quartz of igneous and metamorphic rocks. The planes have a high degree of preferred orientation, and it is believed that they represent fractures in the quartz grains that have been filled with intergranular liquid which subsequently changed to individual inclusions by differential solution and deposition of silica. The planes of inclusions commonly...

W. Mittlefehldt, D. K. Ross, R. C. Greenwood, M. Anand, I. A. Franchi, M. M. Grady, and B. L. A. Charlier. Department of Physical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK (Email: [email protected]), Astromaterials Research Office, NASA Johnson Space Center, Houston, TX, 77058, USA, Jacobs Technology, 2224 Bay Area Blvd. Houston Tx 77058, USA, Department of ...

Introduction: The olivine-phyric basaltic shergottites (OPSs) have recently been recognized as a significant sub-group of the Martian meteorites. These rocks have many characteristics suggestive of a primitive nature such as high bulk and olivine-core Mg#s [1]. [2,3] conducted crystallization experiments using the composition of Yamato 980459 (Y98), an OPS. Results of these experiments show tha...

5 Thalassinoides sp. 19 INTRODUCTION 6 Genus Trichichnus Frey, n. gen. 20 Purpose and scope 6 Trichichnus linearis Frey, n. sp. 20 Stratigraphy 6 Genus Zoophycos Massalongo, 1855 22 Correlation of Fort Hays exposures 9 Zoophycos sp. A 22 Petrology 9 Zoophycos sp. B 22 Paleontology 9 Miscellaneous burrows 23 Acknowledgments 10 Arthrophycus-like burrows 23 TRACE FOSSILS (ICHNOLOGY) 10 Scaphopod-s...