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·Contact between kersantite rare fine grained igneous rock that contains phenocrysts of phlogopite with other mafic minerals and also feldspars It is a variety of lamprophyre 1 and granite Width of view 16 cm Note that there are one larger and several smaller pieces of granite within kersantite Which one is older then granite or kersantite
A xenolith within a granite is as old as the granite O older than the granite O younger than the granite O none of these The Silurian is older than O the Jurassic the Ordovician o the Cambrian O all of these none of these A chalk layer is deposited above a lava flow dated at 95 million years
·older granite intruded into this series has been con verted to gneiss Locally unmetamorphosed" basic igneous rocks are intruded into the older rocks The youngest and one of the most widespread of the Pre cambrian rocks is a coarse grained white or pink granite with associated pegmatite aplite and lam prophyric dikes "
The rock is generally megacrystic and on the watershed west of Leung Tin Estate shows a progressive westward increase in megacryst content A xenolith of basic igneous rock up to 150 mm across was seen about 1 km south of Tsing Shan 813200 826700 Jms 5 This rock possibly lava is fine grained and greyish green with small feldspar phenocrysts
Sills In geology a sill is a tabular sheet intrusion that has intruded between older layers of sedimentary rock beds of volcanic lava or tuff or even along the direction of foliation in metamorphic term sill is synonymous with concordant intrusive sheet or just concordant means that the sill does not cut across preexisting rocks in contrast to dikes
In places the rock is porphyritic with randomly scattered euhedral alkali feldspars up to 20 mm The coarse grained granite is intruded by fine grained granite in many places with a very irregular contact well exposed in road cuttings at Lai Yiu Road 831610 823580 Jkt 27 and Cho Yiu Chuen 831340 823270 Jkt 28 In both cases the contacts
·The granite vein is younger than the gneiss limestone and mudstone layers it cuts through as per the principle of crosscutting relationships O Sedimentary rocks were deposited then intruded by lava that formed igneous rock O An igneous rock formed and sedimentary rocks were deposited around it An earthquake occurred and formed a
· a A section of a sub horizontal pegmatite vein from the Rønne granite Bornholm Island line A indicates the footwall contact of the pegmatite with the granite; graphic granite is present between A and B; and C is the centre of the vein with large smoky quartz crystals in a compact quartz core The irregular pale area between A and B
·Quick facts and properties Name Basalt Rock type Igneous Origin Extrusive Texture Fine grained or aphanitic with grain sizes less than 1/16 mm but may be porphyritic vesicular subophitic ophitic or amygdaloidal Colors Dark gray dark green gray greenish black to black Cooling rate or history Fast on the Earth s surface Chemical composition Mafic or basic
Igneous rock is formed when liquid rock freezes into a solid molten material is called magma when it is in the ground and lava when it is on the surface Only the Earth s outer core is liquid; the Earth s mantle and crust is naturally solid However there are a few minor pockets of magma that form near the surface where geologic processes cause melting
·South Khetri fold belt where it occurs as vein dykes and medium sized plugs associated with mafic ultramafic and pelitic rocks along shear zones and deep seated fractures During present work we found small veins of albitite intruded within the Udaipurwati granite gneiss Fig 2 which lies 6 km west of Albitite line in the SKB Such albi
·Granite upper left and aplitic vein lower right cutting through it Aplite and granite are similar in composition but differ greatly in grain size Granite formed before and its crystals as it seems had ample time to grow The vein intruded the already solidified granitic rock body and solidified quickly due to rapid heat loss
Sills In geology a sill is a tabular sheet intrusion that has intruded between older layers of sedimentary rock beds of volcanic lava or tuff or even along the direction of foliation in metamorphic rock The term sill is synonymous with concordant intrusive sheet This means that the sill does not cut across preexisting rocks in contrast to dikes discordant intrusive sheets
·The word igneous is derived from the Latin word ignus meaning fire or term igneous applies to natural process relating to the formation movement and cooling of molten materials—magma hot molten material underground and lava molten material flowing on or near the surface Figure 8 1 In geology the word igneous applies to materials that
·Chingezi Gneiss is intruded by a number of weakly foliated pre Mashaba Chibi dyke swarm plutons of diorite tonalite and adamellite which include the Chingezi Tonalite Sample suites from four localities of the Chingezi tonalite have Pb Pb whole rock ages between 2874 ±32 and 2686 ± 94 Ma and Rb Sr whole rock
Figure Xenoliths of mafic rock in granite Victoria The fragments of dark rock have been broken off and incorporated into the light coloured granite Some upward moving magma reaches the surface resulting in volcanic eruptions but most cools within the crust The resulting body of rock is known as a pluton Plutons can have
Phyllite with a small fold Source Peter Davis Phyllite is a foliated metamorphic rock in which platy minerals have grown larger and the surface of the foliation shows a sheen from light reflecting from the grains perhaps even a wavy appearance called to phyllite but with even larger grains is the foliated metamorphic rock schist which has large platy grains
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·In the upper part of QAPF classification of plutonic rocks Streckeisen 1976 the granite field is defined by the modal composition of quartz Q 20 60 % and the P/ P A ratio between 10 and 65 The granite field comprises two sub fields syenogranite and monzogranite Only rocks projecting within the syenogranite are considered granites in the
5 ·Included within the basement rocks are a series of bodies of granite formed by the solidification of molten rock or magma intruded into the sedimentary layers at depth All the granite bodies from Dartmoor to the Isles of Scilly have been shown by geophysical surveys to be connected together deep below the surface
·The Shangkelan intrusion is a typical highly evolved pluton in the Chinese Altai orogen and shows a zonal structure consisting mainly of alkali feldspar granite AFG at the center and granitic pegmatite GP at the northern and western margin Fig 2 a Whole rock Rb Sr dating for the AFG gave an age of 183 ± 38 Ma Hu et al 1997 or 181 ± 9 Ma Chen
Figure Xenoliths of mafic rock in granite Victoria The fragments of dark rock have been broken off and incorporated into the light coloured granite [SE] Some upward moving magma reaches the surface resulting in volcanic eruptions but most cools within the crust The resulting body of rock is known as a pluton Plutons can have
volcanic rock Igneous rock that solidified on surface following a volcanic eruption; extrusive rock or lava; generally cools quickly therefore is fine grained W wall rock The rock enclosing a vein or mineral deposit; the rock intruded by and surrounding an igneous intrusion see country rock Y
is a tabular sheet intrusion that has intruded between older layers of sedimentary rock beds of volcanic lava or tuff or even along the direction of foliation in metamorphic rock beneath the earth s surface Intrusive igneous rock granite crystal "slushy" Gases H20 C02 etc dissolved in magma Pahoehoe flow Basaltic lava flow that
Breaking the rock; When magma forces itself into cracks breaks off pieces of rock and then envelops them this is called stoping The resulting fragments are xenoliths [1] Xenoliths may appear as dark patches within a rock Figure Figure Xenoliths of mafic rock in granite Victoria The fragments of dark rock have been
Acid Igneous rock In these rocks silica content ranges between 65 to 85 per cent and average density ranges between to Acid igneous rocks are composed of Quartz white and pink feldspar The most predominant example of such type of rock is granite See Figure 4 Basic Igneous Rocks
If you are using the printed version of this OER access the quiz for section via this QR Code Metamorphic Environments As with igneous processes metamorphic rocks form at different zones of pressure depth and temperature as shown on the pressure temperature P T diagram The term facies is an objective description of a rock In metamorphic rocks facies are groups
