a nonfoliated metamorphic rock

... Metamorphic Rocks Porphyroblastic means that a metamorphic rock has one or more metamorphic minerals that grew much larger than the others Each individual crystal is a porphyroblast Foliated Metamorphic ... Foliated Metamorphic Rocks • What is Cleavage? ✦ a foliation formed by platy minerals such as mica Most commonly used to describe lowgrade micaceous (pelitic) rocks such as slate Foliated Metamorphic ... Foliated Metamorphic Rocks • What is Foliation: Passchier & Trouw, 1996 General term that describes a planar fabric; typically defined by platy minerals such as mica or flattened grains such as quartz...

Ngày tải lên: 30/11/2016, 15:31

... dụ: Company name Đá thuần cát kết  thạch anh  Đá macma mafic  hoặc đá sét vơi  quaczit Đá phiến lục  Company name Biến chất tiếp xúc (CONTACT METAMORPHISM) Company name Biến chất do macma xâm nhập vào đá vây  ... Company name II Đá biến chất tiếp xúc: Company name Đá sừng: Đá được thành tạo do tiếp xúc c a macma acid với đá sét Thành phần khống vật chủ yếu là  thạch anh, mica, fenpat, granat,  andalusit, silimanit, đơi khi có amphibol ... thạch anh mica, hoặc đá phiến thạch anh 7 Quartzit: Company name Đá hoa (cẩm thạch): Company name Là đá biến chất từ đá vôi, thành phần  chủ yếu là hạt kết tinh c a calcite   Màu c a đá hoa tùy thuộc màu c a ...

Ngày tải lên: 26/02/2014, 12:20

... there are many small areas in the large central grain that are not extinct because of surface damage caused by the thin section grinding process The micas and calcite have this surface damage effect ... in a muscovite-biotite schist Staurolite has parallel extinction and one cleavage parallel to its length, and has a characteristic pale to darker golden yellow pleochroism This example has a twin, ... relief It can accept limited amounts of uranium and thorium into its structure, and so can produce radiation halos that are generally weaker than those surrounding zircon and allanite (no halo visible...

Ngày tải lên: 29/09/2014, 17:15

... mineral matter   Minerals precipitated in a facture are called a vein Metamorphic changes that occur while temperatures and pressures are rising (usu In presence of intergranular fluid) are ... Fluids and Metamorphism (4)   When intergranular fluids are absent, metamorphic reactions are very slow When pressure increases due to burial of a rock, and as metamorphism proceeds, the amount ... termed prograde metamorphic effects (prograde metamorphism) Figure B8.2 Fluids and Metamorphism (6)  Metamorphic changes that occur as temperature and pressure are declining (and usually after much...

Ngày tải lên: 29/09/2014, 20:55

... Figure 7. 7a Figure 7.7b Figure 7. 8a Marble Figure 7. 8a2 Marble in thin section Figure 7.9 Quartzite Figure 7.1 0a Slate Figure 7.10b Slate Figure 7.11 Phyllite Figure 7.12 Garnet-mica schist Figure ... Text Art 7.1 Figure 7.5 New Minerals form New minerals are: Platy Elongate Figure 7.6 Figure 7.18 Effects of temperature and pressure Figure 7.3 Pressure Figure 7.4b Figure 7. 4a Figure 7.1 ... 7.14 Contact metamorphism vs Regional metamorphism Figure 7.23 Figure 7.17 Isotherms: Figure 7.19 Metamorphism at the mid-oceanic ridge: Figure 7.20 Figure 7.15 Gneiss: Figure 7.8b Marble: Figure...

Ngày tải lên: 30/11/2016, 15:32

... becomes an igneous rock Metamorphic Rocks are classified as either foliated or nonfoliated FOLIATED •When the parent rock softens the mineral grains are flatten by heat and pressure •This causes ... the metamorphic rock to show a striped or banded look in some rocks •Examples of foliated metamorphic rocks are gneiss, schist and slate Granite f oliates i nto Gneis s parent rock foliated metamorphic ... Which sample is showing a sedimentary rock? #4 NON-FOLIATED •Mineral grains grow and rearrange, but not form bands or stripes •Examples of nonfoliated metamorphic rocks include quartzite and marble...

Ngày tải lên: 30/11/2016, 15:32

...  Marble  Bioclastic calcite Crystallie calcite  Metamorphic Rocks of other Parent Rocks  Quartz Sadstoe   Graular quartz  Crystallie quartz Quartzite Metamorphic Rocks of other Parent ... separate ito appear: feldspar bads  Geissic badig bads of dark a d light mierals Prograde Metamorphism of Shale 5: Very HighGrade Metamorphism a d partial meltig Migmatite  Silica rich ... The Rock Cycle  Geological Materials Transformation Processes  Rock Metamorphism (Icreased & P)  T Metamorphic rock Partial Meltig  Magma Metamorphism Metamorphic Rocks Defiitio:...

Ngày tải lên: 30/11/2016, 15:32

... textures ■ Slate: If the cleavage planes are very thin and the rock is fine grained, the cleavage is called slaty cleavage and the rock is called slate Slate is usually produced by low-grade metamorphism ... with a foliation of alternating light- and dark-colored bands known as gneissic texture ■ Foliated Metamorphic Rocks ■ Names for foliated metamorphic rocks are typically based on their foliated ... information about metamorphic conditions on rock and about the geologic history of a region ■ This metamorphic rock, California exhibits a slaty cleavage The type of rock cleavage allows it to split easily...

Ngày tải lên: 30/11/2016, 15:32

... size and and type type of of magma magma important important size >> mafic magma magma hotter hotter than than felsic felsic mafic heat decreases decreases away away from from magma magma heat ... Metamorphism Contact •• Contact caused by by igneous igneous activity activity caused Dynamic •• Dynamic aka cataclastic cataclastic aka associated with with faults faults & & earthquake earthquake zones ... rock Dynamic Metamorphism aka Cataclastic Cataclastic Metamorphism Metamorphism •• aka associated with with Fault Fault Zones Zones •• associated -Places where where the the Earth's Earth's crust...

Ngày tải lên: 30/11/2016, 15:34

... consist of mineral grains that have a random orientation By contrast, deformed metamorphic rocks that contain platy minerals (micas) and/or elongated minerals (amphiboles) typically display some kind ... such as garnets Nonfoliated Metamorphic Rocks Marble Quartzite The exterior of the Taj Mahal is constructed mainly of the metamorphic rock marble Metamorphic Environments Hydrothermal metamorphism ... not usually split as easily as slates and schists Gneisses that cleave tend to break parallel to their foliation and expose micarich surfaces that resemble schist Foliated Metamorphic Rocks Gneiss...

Ngày tải lên: 30/11/2016, 15:34

... fine grained rocks is called slaty cleavage Shale Slate PHYLLITES - usually associated with intermediate grade of metamorphism; where the mineral grains grows large in size as compare to that seen ... -overall dull appearance PHYLLITE -similar to slate, but slightly coarser phyllosilicate grains -grains can be seen in hand specimen, giving silk appearance to cleavage surfaces -often cleavage ... planes less perfectly planar than slates SCHIST -parallel alignment of moderately coarse grains (fabric=schistocity) -grains are visible by eye -mainly phyllosilicates and other minerals such as...

Ngày tải lên: 30/11/2016, 15:34

... moderate-grade metamorphic rock that contains aligned platy mica minerals and has slaty cleavage The individual crystals are fine grained and generally consist of muscovite, white mica, and chlorite ... example of a metamorphic rock with a nonfoliated texture 23 Table of Contents Nonfoliated Rocks: Marble    Marble is a nonfoliated, coarse-grained metamorphic rock formed from the parent rock ... mineral grains in metamorphic rocks display preferential orientations where the alignment of the minerals is parallel or subparallel to one another  Rocks that exhibit parallel or sub-parallel...

Ngày tải lên: 30/11/2016, 15:34

... higher metamorphic grade comes increased crystal size The faces of the larger grains are more reflective than smaller grains, and so the cleavage planes of the rock have a greater sheen than they ... coarse grains at the base grading to dark, fine grains at the top As well, we notice that the foliation and cleavage, parallel to the broad faces of the sample, are unrelated to the original bedding, ... whose planes are parallel to the light blue arrows Phyllite This is also a low grade metamorphic rock, but is of a higher grade than slate Cleavage planes are highlighted by yellow stars With...

Ngày tải lên: 30/11/2016, 15:34

... Contact (Heat) Quartz Regional Calcite and/or Dolomite (Heat & Pressure) Various minerals in particles and matrix Comment Rock Name Various rocks changed by nearby magma/lava Hornfels Metamorphism ... (Sedimentary Rock) Heat & Pressure Slate (Metamorphic Rock) Slate (Metamorphic Rock) Heat & Pressure Phyllite (Metamorphic Rock) Phyllite (Metamorphic Rock) Heat & Pressure Schist (Metamorphic Rock) With ... the rock Types of Metamorphic Rocks  Foliated: rocks with mineral crystals arranged in cable-like distorted layers/structures Mineral Alignment  Banding  Animation: Foliation   Nonfoliated: ...

Ngày tải lên: 30/11/2016, 15:34

... What is a metamorphic rock?  The term "metamorphic" means "to change form."  Any rock (igneous, sedimentary, or metamorphic) can become a metamorphic rock If rocks are buried deep in the Earth ... into parallel layers The bands in foliated metamorphic rock look like pages in a book Examples of foliated rocks are slate, shale, and gneiss To change form Other rocks are exposed to high heat ... change form Foliated Other rocks are exposed to high heat & pressure Non-Foliated Foliated Metamorphic Rocks   FOLIATED metamorphic rocks are those in which the minerals have been flattened and...

Ngày tải lên: 30/11/2016, 15:34

... material is added to rock during metamorphism metamorphic rock will have similar composition to parent rock if parent material contains only one mineral resultant metamorphic rock will only have ... “shocked” rocks around impact craters migmatite igneous and metamorphic textures hydrothermal alteration along mid-ocean ridge cold sea water encounters hot basalt, forms steam, alters minerals plate ... foliated (layered) metamorphic rocks results from differential stress (not equal in all directions) foliation appearance under microscope non-foliated foliated foliated metamorphic rock: slate...

Ngày tải lên: 30/11/2016, 15:34

... recrystallize into stable ones • Rocks produced from pre-existing or parent rocks in this way are called metamorphic rocks bread toast Metamorphic Rocks • Metamorphic rocks common in the old, stable ... Hydrothermal processes add water for metamorphic reactions • Formation of hydrothermal rocks • Water passes through rocks and precipitates new minerals on walls of cracks and in pore spaces • Metallic ... foliation Metamorphic Rock Classification • Classification based on rock texture – Foliated (layered) vs non-foliated (non-layered) – Foliated rocks named based on type of foliation (slaty, schistose,...

Ngày tải lên: 30/11/2016, 15:34

... SED-MET ROCKS-AGE • Erosion • removal or transportation of material by stream water, glacial ice, wind, and gravity • eroded materials may eventually accumulate in large amounts • Lithification ... Kinds of metamorphic rocks • all but one rock is comprised of silicate minerals • foliated • minerals are aligned in a pattern Foliated metamorphic rocks Foliated or Lineated Metamorphic Rocks Gneiss ... (clastic) Sedimentary Sandstones Graywacke Arkose Quartz Sandstone Detrital (clastic) Sedimentary Rocks Smaller Grained Claystone Siltstone Shale SED-MET ROCKS-AGE • biological (organic) rocks...

Ngày tải lên: 30/11/2016, 15:37

... temperature, pressure & parent rock Increasing Grade & relevant facies Index minerals REGIONAL METAMORPHISM OF SHALES Increasing Grade & relevant facies Index minerals REGIONAL METAMORPHISM OF BASALTS ... pressure Increasing Temperature METAMORPHIC FACIES: mineral assemblages Original chemistry of parent rock controls the mineral assemblage formed during metamorphism Metamorphic Index minerals • INDEX ... formed under a similar range of pressure and temperature conditions METAMORPHIC FACIES: typical settings Intraplate: normal range Contact: High temperature Arc: increased temperature Subduction...

Ngày tải lên: 30/11/2016, 15:37

... Metamorphism: Axial Planar Cleavage Relationship o cleavage to folding Axial-planar cleavage Axial Planar cleavage Processes of Cleavage Development • • • • Rotation of minerals Crenulation Pressure ... Courtesy of David Gray, Monash University, Australia Sandstone after compaction Beginning of foliation Crenulation Cleavage Small scale kinks and pressure solution surfaces Crenulation Cleavage Beginning ... solution – Passive rotation – Recrystallization • Shear zones Geothermal Gradient and Metamorphism Naming of Metamorphic Rocks Slatey cleavage Gneiss Looks Like Bedding, but is it? Metamorphic layering...

Ngày tải lên: 30/11/2016, 16:07