kingsam
 |  موضوع: Microscopic Study Results  24/11/2010, 06:55 | |
| Sample No. 1
Sample type: rock sample
Rock name: diorite
Rock type: intermediate igneous rock
Texture: medium-grained intergranular texture
Mineral composition: the rock is composed of plagioclase, biotite
and amphibole together with accessory opaque minerals
The plagioclase crystals are subhedral in
form and show a lamellar or simple twinning
Biotite crystals are yellowish green in color
and they appear in a tabular form
Amphibole is green in color and appears
in a tabular or fibrous form
Alteration: not noticeable
Opaques: not very common[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Sample No. 2
Sample type: rock sample
Rock name: microgranite
Rock type: felsic igneous rock
Texture: fine-grained intergranular texture
Mineral composition: the rock is
composed of k-feldspar, quartz
and plagioclase together
with accessory biotite
The k-feldspar is of orthoclase and it appears
in an irregular form Quartz is abundant
it appears in an irregular form
Plagioclase is relatively finer and less abundant compared to k-feldspar
Alteration: the feldspar crystals are rimmed with sericite
Opaques: very rare[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]Sample No. 3
Sample type: rock sample.Rock name: diorite
Rock type: intermediate igneous rock
Texture: medium-grained intergranular texture
Mineral composition: the rock is composed of plagioclase, amphibole and biotite together
with accessory quartz and opaque minerals
The plagioclase crystals are subhedral in form and they show a lamellar twinning
Alteration: plagioclase is slightly affected by sericite alteration. Some amphiboles
are formed after plagioclase
Opaques: common; they are found scattered in the rock as tiny irregular grains[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]Sample No. 4
Sample type: rock sample
Rock name: microgranite
Rock type: felsic igneous rock
Texture: fine-grained micrographic texture
Mineral composition: the rock is composed of k-feldspar and quartz together
with accessory biotite and opaque minerals
The k-feldspar and quartz are intergrowing
forming the micrographic texture
Biotite is not very common; it appears in aggregates as fine tabular crystals
Alteration: the rock is slightly affected by sericite-muscovite alteration
Opaques: common; they are found scattered in the rock as tiny irregular grains[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]Sample No. 5
Sample type: rock sample
Rock name: amphibolite
Rock type: metamorphic rock
Texture: medium-grained schistose texture
Mineral composition: the rock is composed of amphibole, plagioclase, quartz and garnet
The amphibole is a green verity
and it appears in an elongated tabular form
it shows orientation in the direction of schistosity
Plagioclase is anhedral in form and shows a lamellar
or simple twinning
Garnet is common; it appears in an irregular form
Alteration: not noticeable
Opaques: very rare[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]Sample No. 6
Sample type: rock sample
Rock name: diorite
Rock type: intermediate igneous rock
Texture: medium-grained intergranular texture
Mineral composition: the rock is composed of plagioclase, amphibole and biotite
The plagioclase crystals are subhedral to anhedral in form and show a lamellar twinning
Amphibole is dark green in color
and appears in a tabular or fibrous form
Biotite is reddish brown in color and appears in a corroded tabular form
Alteration: the rock is slightly affected by alteration
The alteration products are sericite-muscovite, epidote and chlorite
Opaques: not very common[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] Sample No. 7
Sample type: rock sample
Rock name: microgranodiorite
Rock type: intermediate igneous rock
Texture: fine-grained intergranular texture
Mineral composition: the rock is composed of plagioclase, quartz, biotite and k-feldspar
The plagioclase is anhedral in form
and shows a lamellar twinning
Quartz is abundant; it appears in an irregular form. Biotite is wide spread in the rock; it appears
in a fine prismatic form
and shows a brownish color
Alteration: the rock is affected by a slight sericite-muscovite alteration
Opaques: not very common[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] Sample No. 8
Sample type: rock sample
Rock name: diorite
Rock type: intermediate igneous rock
Texture: medium grained intergranular texture
Mineral composition: the rock is composed of plagioclase, amphibole, biotite and quartz
The plagioclase crystals are anhedral in form
and show a lamellar twinning
Amphibole is a green verity
and it appears in a tabular form
Biotite appears in a tabular form and shows a yellowish brown color
Quartz is abundant; it appears as fine grins filling
the interstitial spaces between other crystals
Alteration: plagioclase is affected by a slight sericite alteration
Opaques: very rare [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] Sample No. 9
Sample type: rock sample
Rock name: microgranodiorite
Rock type: intermediate igneous rock
Texture: fine-grained intergranular texture with graphic texture appearing locally
Mineral composition: the rock is composed of plagioclase, amphibole
and quartz together with accessory opaque minerals
The plagioclase is subhedral in form and it shows a simple or lamellar twinning
Amphibole is a green verity; it appears in an irregular form and fills the interstitial spaces
between plagioclase crystals
Quartz is common; it appears in an irregular
form filling the interstitial spaces
between plagioclase crystals, it is also forming the graphic texture
Alteration: the rock is moderately affected by sericite alteration
Opaques: common; they are found scattered in the rock as tiny irregular grains Sample No. 10
Sample type: rock sample
Rock name: mylonite
Rock type: metamorphic rock
Texture: mylonitic texture; fine-grained groundmass showing
orientation and containing
uncrushed grains of the original rock
The rock is also microfractured and the microfractures
are aligned in the direction of orientation
Mineral composition: the fine groundmass consists of quartz
and micaceous minerals together with epidote and carbonate
The uncrushed grains are of feldspar and quartz
Alteration: not noticeable
Opaques: common; they are found scattered in the rock as tiny irregular grains[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] Sample No. 11
Sample type: rock sample
Rock name: mylonite
Rock type: metamorphic rock
Texture: microfractured mylonitic texture
Mineral composition: the groundmass of the rock consists of very
fine quartz feldspars
and micaceous minerals plus opaque minerals
The uncrushed grains are of feldspars and quartz
Alteration: the rock is affected by iron oxide staining
Opaques: common; they are found scattered in the rock
as tiny irregular grains[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] Sample No. 12
Sample type: rock sample
Rock name: microgranodiorite
Rock type: intermediate igneous rock
Texture: fine-grained intergranular texture
Mineral composition: the rock is composed of plagioclase, quartz, biotite
and amphibole together
with accessory opaque minerals
The plagioclase is anhedral in form and shows
a lamellar or simple twinning
Quartz is abundant; it is found filling
the interstitial spaces between plagioclase crystals
Biotite is tabular in form
and shows a reddish brown color
Amphibole is not wide spread in the rock
it is a green verity and it appears an irregular form
Alteration: plagioclase is slightly affected by sericite alteration
Opaques: not very common [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] Sample No. 13
Sample type: rock sample
Rock name: highly silicified rock
Remarks: the original composition and type of rock
cant be identified due to high silicification
The rock examined is composed mainly of quartz
which appears in various forms and sizes
In addition to quartz the rock contains
a large amount of the alteration products: epidote
muscovite and carbonate[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]Sample No. 14
Sample type: rock sample
Rock name: amphibolite
Rock type: metamorphic rock
Texture: fine to medium-grained intergranular texture
Mineral composition: the rock is composed of plagioclase and amphibole together
with quartz and alteration products
The plagioclase is tabular in form and shows
a lamellar twinning
Amphibole is a reddish green verity
and it appears in a tabular form
Quartz is common in the rock
Alteration: the rock is highly affected by alteration
The alteration products are chlorite
carbonate and sericite
Opaques: very common; they are found scattered in the rock as tiny irregular grains [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]Sample No. 15
Sample type: rock sample
Rock name: diabase
Rock type: basic igneous rock
Texture: ophitic texture
Mineral composition: the rock is composed of plagioclase, pyroxene
and biotite together with opaque minerals
The plagioclase appears
in a subhedral form and shows a lamellar twinning
Pyroxene appears in a distinct granular form
and shows a neutral color
biotite crystals are relatively coarser showing a reddish brown color
and they contain inclusions of plagioclase crystals
Alteration: not noticeable
Opaques: common; they are found scattered
in the rock as tiny irregular grains
and some times forming an intergrowth with plagioclase [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] Sample No. 16
Sample type: rock sample
Rock name: volcanic breccia
Rock type: pyroclastic rock
Texture: different sizes of angular fragments cemented by tuffacious material
Mineral composition: the fragments are of quartz and plagioclase, which are cemented
by tuffacious material
Alteration: the fragments are highly affected by sericite alteration
and iron oxide staining
Opaques: common; they are found squeezed between
the fragments and also as tiny irregular grains[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] Sample No. 17
Sample type: rock sample
Rock name: crystal tuff of intermediate composition
Rock type: pyroclastic rock
Texture: tuffacious texture
with fine crystals embedded with in
Mineral composition: the tuffactious material is composed
of feldspars and quartz
The crystals are of plagioclase, quartz and biotite
The plagioclase crystals are subhedral to euhedral in
form and show a simple twining and show zoning
The quartz crystals are less abundant
Biotite crystals are tabular in form and sow
a green color
Alteration: the rock is moderately affected by alteration
The alteration products are sericite-muscovite
chlorite, epidote and carbonate
Opaques: very common; they are found scattered
in the tuffacious groundmass as tiny irregular grains[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]Sample No. 18
Sample type: rock sample
Rock name: highly altered microgranodiorite
Rock type: intermediate igneous rock
Texture: fine-grained intergranular texture
Mineral composition: the rock is composed of plagioclase
and amphibole together
with accessory quartz and opaque minerals
The plagioclase is almost completely altered
to sericite and muscovite
Amphibole is dominant; it is
a dark green verity and in some cases
it is formed after the alteration of plagioclase
Alteration: the plagioclase is highly affected by sericite-muscovite alteration
and some of it is altered to amphibole
Opaques: common; they are found scattered in the rock as tiny irregular grains[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] | |
|
theredrose
| | موضوع: رد: Microscopic Study Results 24/11/2010, 15:55 | |
| مبدع سامو بس الصور مش ظاهرة | |
|
