Salt Plugs in the Eastern Zagros, Iran: Results of
... 6 m thick coarse-grained deposits. The terraces of the lower group contain only a thin cover of coarse-grained clastics (2 to 5 m). The slope angles of anticlines are associated principally with strata dips (relatively flat summits and steeper slopes). Resistant rock types (limestones, dolostones, s ...
... 6 m thick coarse-grained deposits. The terraces of the lower group contain only a thin cover of coarse-grained clastics (2 to 5 m). The slope angles of anticlines are associated principally with strata dips (relatively flat summits and steeper slopes). Resistant rock types (limestones, dolostones, s ...
Nickel - British Geological Survey
... flood basalt suite and are hosted by coeval, elongate, thin mafic sills that intrude Devonian and Carboniferous continental sedimentary rocks including evaporites and coal. The genesis of these deposits is believed to be due to the focused ascent along regional structures of deepsourced metal-bearin ...
... flood basalt suite and are hosted by coeval, elongate, thin mafic sills that intrude Devonian and Carboniferous continental sedimentary rocks including evaporites and coal. The genesis of these deposits is believed to be due to the focused ascent along regional structures of deepsourced metal-bearin ...
Geological Survey of Denmark and Greenland Map Series 2
... Iron-sulphide mineralisation (py). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Black sands, mainly ilmenite (il). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mineralisation not on the map. . . . . . . . . . . . . . . . . . . . . . ...
... Iron-sulphide mineralisation (py). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Black sands, mainly ilmenite (il). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mineralisation not on the map. . . . . . . . . . . . . . . . . . . . . . ...
Stratigraphic Framework of the
... sedimentary rocks are mainly limestone and volcaniclastic sedimentary rocks that are interpreted to have been deposited along an island arc. Magmatic activity was associated with movement of the Alaska Peninsula to near its present position in Middle Jurassic time. This activity resulted in the empl ...
... sedimentary rocks are mainly limestone and volcaniclastic sedimentary rocks that are interpreted to have been deposited along an island arc. Magmatic activity was associated with movement of the Alaska Peninsula to near its present position in Middle Jurassic time. This activity resulted in the empl ...
Mineral Belts of Western Sierra County
... More than 80 percent of the total mineral production of Sierra County has come from mining districts that lie within two relatively narrow northerly trending belts, in the western part of the county; a western belt, which lies along the eastern flank of the Black Range-Mimbres Mountains, and an east ...
... More than 80 percent of the total mineral production of Sierra County has come from mining districts that lie within two relatively narrow northerly trending belts, in the western part of the county; a western belt, which lies along the eastern flank of the Black Range-Mimbres Mountains, and an east ...
PETROLOGY AND GEOCHEMISTRY OF THE WILDCAT GULCH
... lithologic character, ascertain their origin, or place them within the regional geology of central Colorado. These syenitoid intrusions may be related to the igneous rocks of the ~1700 Ma Routt Plutonic Suite that formed during the Colorado orogeny that included episodes of arc collision and accreti ...
... lithologic character, ascertain their origin, or place them within the regional geology of central Colorado. These syenitoid intrusions may be related to the igneous rocks of the ~1700 Ma Routt Plutonic Suite that formed during the Colorado orogeny that included episodes of arc collision and accreti ...
Paleomagnetic Rotation Study of Woodlark
... ~3 Ma. The Amphlett Islands result is consistent with the rate of Pliocene sea floor spreading in the Woodlark Basin, suggesting that locality can be considered as fully on the Woodlark Plate. The clockwise rotation indicated at NW Normanby Island may record development of an incipient dextral trans ...
... ~3 Ma. The Amphlett Islands result is consistent with the rate of Pliocene sea floor spreading in the Woodlark Basin, suggesting that locality can be considered as fully on the Woodlark Plate. The clockwise rotation indicated at NW Normanby Island may record development of an incipient dextral trans ...
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... of protoliths in the aureole preserve the reactions that, taken together, suggest peak contact metamorphic conditions with temperatures in excess of 600°C at a pressure of 0.1 – 0.2 GPa (Dini et al. 2002). This pressure estimate matches well with an emplacement depth of 4.5 km based on reconstructio ...
... of protoliths in the aureole preserve the reactions that, taken together, suggest peak contact metamorphic conditions with temperatures in excess of 600°C at a pressure of 0.1 – 0.2 GPa (Dini et al. 2002). This pressure estimate matches well with an emplacement depth of 4.5 km based on reconstructio ...
Rhenium^Osmium Isotope and Platinum-Group Element
... isotopic compositions (gOsi ¼ þ 10 to þ 876; eNdi ¼ 04 to 66; d18OOl ¼ þ 55 to þ 69ø) and highly siderophile element abundances (HSE: PGE and Re; Re ¼ 002^105 ppb; Pt ¼ 023^ 115 ppb; Os ¼ 002 to 4 200 ppb). HSE and fluid-immobile trace element abundance variations are consistent with rela ...
... isotopic compositions (gOsi ¼ þ 10 to þ 876; eNdi ¼ 04 to 66; d18OOl ¼ þ 55 to þ 69ø) and highly siderophile element abundances (HSE: PGE and Re; Re ¼ 002^105 ppb; Pt ¼ 023^ 115 ppb; Os ¼ 002 to 4 200 ppb). HSE and fluid-immobile trace element abundance variations are consistent with rela ...
Understanding the textures and origin of shock melt pockets in
... and they have been subjected to violent phenomena, which have left a record in the rocks in quenched reaction textures. In this paper, we present a review of textures from terrestrial and extraterrestrial samples focusing on the petrography of reaction zones formed by the interaction of melt with ea ...
... and they have been subjected to violent phenomena, which have left a record in the rocks in quenched reaction textures. In this paper, we present a review of textures from terrestrial and extraterrestrial samples focusing on the petrography of reaction zones formed by the interaction of melt with ea ...
Transfer of melts in the sub-arc mantle: Insights from high
... Two main groups have to be distinguished in terms of emplacement. On one hand, orogenic ophiolites are elongated terranes which typically occur in collisional zones (e.g. Alps, Himalayas, Rockies, Appalachian, etc.). Although these ophiolitic bodies are very common, their structure is often strongl ...
... Two main groups have to be distinguished in terms of emplacement. On one hand, orogenic ophiolites are elongated terranes which typically occur in collisional zones (e.g. Alps, Himalayas, Rockies, Appalachian, etc.). Although these ophiolitic bodies are very common, their structure is often strongl ...
Mesozoic tectonics of the Maria fold and thrust belt and McCoy basin
... All the work that goes into conducting research and writing a dissertation may be indeed done by one person, but is actually the result of the efforts and support of many people who should be acknowledged. First of all, I would like to thank Karl Karlstrom, my dissertation advisor. Through his inter ...
... All the work that goes into conducting research and writing a dissertation may be indeed done by one person, but is actually the result of the efforts and support of many people who should be acknowledged. First of all, I would like to thank Karl Karlstrom, my dissertation advisor. Through his inter ...
Zircon - Elements Magazine
... of this, magmatic zircon grains with inherited xenocrystic cores have in several cases been shown to have distinctive 18O/16O isotopic compositions (expressed as δ18O in per mil units, ‰, relative to the Vienna Standard Mean Ocean Water – VSMOW), interpreted as reflecting differences in the isotopi ...
... of this, magmatic zircon grains with inherited xenocrystic cores have in several cases been shown to have distinctive 18O/16O isotopic compositions (expressed as δ18O in per mil units, ‰, relative to the Vienna Standard Mean Ocean Water – VSMOW), interpreted as reflecting differences in the isotopi ...
Rutile in eclogites as a mineral resource in the Sunnfjord
... Although rutile concentrates which meet the specification for chlorination have been produced from hard-rock deposits, the price is a reduction in recovery of rutile. The principal problem is assuring that the CaO content in the concentrate is less than 0.2%, which is not easily obtained since essen ...
... Although rutile concentrates which meet the specification for chlorination have been produced from hard-rock deposits, the price is a reduction in recovery of rutile. The principal problem is assuring that the CaO content in the concentrate is less than 0.2%, which is not easily obtained since essen ...
Crustal Trace Element and Isotopic Signatures in
... and strong serpentinization of the peridotites, it is often difficult to assess the structural relation of the Major elements pyroxenites with their host peridotites. Hence, many Selected major element variation diagrams for lower of the samples used for this study are float blocks. Austrian pyroxen ...
... and strong serpentinization of the peridotites, it is often difficult to assess the structural relation of the Major elements pyroxenites with their host peridotites. Hence, many Selected major element variation diagrams for lower of the samples used for this study are float blocks. Austrian pyroxen ...
Petrology and Geochemistry of the Nipissing Gabbro
... A1.1 Geological map of the Nipissing Gabbro exposed around Lake Temagami . . . . . . . . . . . . . . . . . . . . . . . . . . 51 A1.2 Geological map of the Narrows Island dyke, Lake Temagami . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 A1.3 Geological map of the Sand Poi ...
... A1.1 Geological map of the Nipissing Gabbro exposed around Lake Temagami . . . . . . . . . . . . . . . . . . . . . . . . . . 51 A1.2 Geological map of the Narrows Island dyke, Lake Temagami . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 A1.3 Geological map of the Sand Poi ...
Accuracy of plagioclase compositions from laboratory and Mars
... [7] First, we examine terrestrial volcanic rocks and focus on the mixing of phenocryst and groundmass plagioclase. We use laboratory geochemical and spectral analyses to address whether the assumption of sodic plagioclase in mesostasis and normal zoning in terrestrial volcanic rocks is correct, and ...
... [7] First, we examine terrestrial volcanic rocks and focus on the mixing of phenocryst and groundmass plagioclase. We use laboratory geochemical and spectral analyses to address whether the assumption of sodic plagioclase in mesostasis and normal zoning in terrestrial volcanic rocks is correct, and ...
FRICTIONAL PROPERTIES OF NATURAL FAULT GOUGE FROM A
... In our study area (Figure 3), the low-angle normal fault is exposed in numerous canyons that have incised through older Pleistocene alluvial deposits into the underlying bedrock. The fault surface dips gently basinward 15°-20° and places poorly sorted, moderately indurated alluvial fan gravels atop ...
... In our study area (Figure 3), the low-angle normal fault is exposed in numerous canyons that have incised through older Pleistocene alluvial deposits into the underlying bedrock. The fault surface dips gently basinward 15°-20° and places poorly sorted, moderately indurated alluvial fan gravels atop ...
Composition, Formation, and Occurrence of Polymetallic Nodules
... interest are nickel, copper, and cobalt, but the nodules also contain interesting amounts of molybdenum, titanium, lithium, and the rare earth elements. Therefore they are also called as polymetallic nodules. The nodules consist of concentrically banded zones of micro-layers around a nucleus. They f ...
... interest are nickel, copper, and cobalt, but the nodules also contain interesting amounts of molybdenum, titanium, lithium, and the rare earth elements. Therefore they are also called as polymetallic nodules. The nodules consist of concentrically banded zones of micro-layers around a nucleus. They f ...
Clark, D.A., Geuna, S., and Schmidt, P.W., 2003
... thermoremanent magnetisation (TRM). Chemical changes to these ferromagnetic minerals at elevated temperature, but below the Curie temperature, produce thermochemical remanent magnetisation (TCRM). Detrital magnetic mineral grains align their magnetic moments with the ambient field as they settle thr ...
... thermoremanent magnetisation (TRM). Chemical changes to these ferromagnetic minerals at elevated temperature, but below the Curie temperature, produce thermochemical remanent magnetisation (TCRM). Detrital magnetic mineral grains align their magnetic moments with the ambient field as they settle thr ...
granites of the lachlan fold belt
... Chappell (1978) pointed out that granites form “images” of their source rocks. This is clearly the case for suites in which the compositional variation was controlled by varying degrees of separation of restite from melt. In such a case, the more mafic rocks would have compositions close to those of ...
... Chappell (1978) pointed out that granites form “images” of their source rocks. This is clearly the case for suites in which the compositional variation was controlled by varying degrees of separation of restite from melt. In such a case, the more mafic rocks would have compositions close to those of ...
Structure and flow properties of syn-rift border faults: The interplay
... prediction of flow-properties of such faults in the subsurface. The main aims are achieved through a set of specific objectives, which are to (i) document the detailed structure of the Dombjerg Fault and it's damage zone; (ii) elucidate the depth of deformation and the relative timing of different dia ...
... prediction of flow-properties of such faults in the subsurface. The main aims are achieved through a set of specific objectives, which are to (i) document the detailed structure of the Dombjerg Fault and it's damage zone; (ii) elucidate the depth of deformation and the relative timing of different dia ...
Rare Earth Elements Profile
... and related igneous rocks and the other with peralkaline15 igneous rocks (Samson and Wood, 2004). Carbonatite-associated deposits Carbonatites are igneous rocks that contain more than 50 per cent carbonate minerals. They are thought to originate from carbon dioxide-rich and silica-poor magmas from t ...
... and related igneous rocks and the other with peralkaline15 igneous rocks (Samson and Wood, 2004). Carbonatite-associated deposits Carbonatites are igneous rocks that contain more than 50 per cent carbonate minerals. They are thought to originate from carbon dioxide-rich and silica-poor magmas from t ...
Rhenium^Osmium Isotope and Platinum
... isotopic compositions (gOsi ¼ þ 10 to þ 876; eNdi ¼ 04 to 66; d18OOl ¼ þ 55 to þ 69ø) and highly siderophile element abundances (HSE: PGE and Re; Re ¼ 002^105 ppb; Pt ¼ 023^ 115 ppb; Os ¼ 002 to 4 200 ppb). HSE and fluid-immobile trace element abundance variations are consistent with rela ...
... isotopic compositions (gOsi ¼ þ 10 to þ 876; eNdi ¼ 04 to 66; d18OOl ¼ þ 55 to þ 69ø) and highly siderophile element abundances (HSE: PGE and Re; Re ¼ 002^105 ppb; Pt ¼ 023^ 115 ppb; Os ¼ 002 to 4 200 ppb). HSE and fluid-immobile trace element abundance variations are consistent with rela ...
the Geologic Map of the Maysville Quadrangle, Chaffee
... east- and southeast-dipping gravel surfaces. The upper slopes of Mount Shavano, above timberline (about 12,000 ft elevation), principally consist of steep talus slopes with some cliff outcrops. Most of the agricultural activity in the Maysville quadrangle is concentrated in Missouri Park, the low-ly ...
... east- and southeast-dipping gravel surfaces. The upper slopes of Mount Shavano, above timberline (about 12,000 ft elevation), principally consist of steep talus slopes with some cliff outcrops. Most of the agricultural activity in the Maysville quadrangle is concentrated in Missouri Park, the low-ly ...
Clastic rock
Clastic rocks are composed of fragments, or clasts, of pre-existing minerals and rock. A clast is a fragment of geological detritus, chunks and smaller grains of rock broken off other rocks by physical weathering. Geologists use the term clastic with reference to sedimentary rocks as well as to particles in sediment transport whether in suspension or as bed load, and in sediment deposits.