mississipi valley type deposit
Post on 02-Jun-2018
232 Views
Preview:
TRANSCRIPT
-
8/11/2019 Mississipi Valley Type Deposit
1/26
MISSISSIPPI VALLEY TYPE(MVT) DEPOSIT
-
8/11/2019 Mississipi Valley Type Deposit
2/26
-
8/11/2019 Mississipi Valley Type Deposit
3/26
Sejarah MVT Amerika Utara(Galena ,Sphalerite,sedikit Kalkopirit )
Banyak ditemukan terbentuk di waktu
PROTEROZOIKUM - CRETACEOUS
Pertama kali ditemukan 70
tahun yang lalu (Bastian 1939)
-
8/11/2019 Mississipi Valley Type Deposit
4/26
Apa sih MVT (Mississippi Valley
Type) itu ?
Endapan MVT terdiri dari kumpulan tubuh bijih dimana silfida Fe, Pb, dan Zn mengisi
rongga pada termokarst atau larutan breksia pada platform karbonat kebagian
cekungan sedimen
Ukuran rata rata Deposit7.0 Mt
32,5 g/t
Ag0.23 %
Cu
6,0 %
Zn
1.9 %
Pb
-
8/11/2019 Mississipi Valley Type Deposit
5/26
-
8/11/2019 Mississipi Valley Type Deposit
6/26
-
8/11/2019 Mississipi Valley Type Deposit
7/26
-
8/11/2019 Mississipi Valley Type Deposit
8/26
-
8/11/2019 Mississipi Valley Type Deposit
9/26
Source Sumber
-
8/11/2019 Mississipi Valley Type Deposit
10/26
Transportation
-
8/11/2019 Mississipi Valley Type Deposit
11/26
The Trap
-
8/11/2019 Mississipi Valley Type Deposit
12/26
Exploration
-
8/11/2019 Mississipi Valley Type Deposit
13/26
-
8/11/2019 Mississipi Valley Type Deposit
14/26
-
8/11/2019 Mississipi Valley Type Deposit
15/26
Mineralisasi
Types of Sulfide Mineralization
There are at least five types of sulfide mineralization present in the
Lavrion district.
1. Porphyry-style mineralization
2. Skarn-style mineralization are spatially associated with the Plaka
granodiorite
3. Breccia-style mineralization
4. Carbonate-replacement Pb-Zn-Ag mineralization5. Vein-style Pb-Zn-Ag mineralization is present at Adami
-
8/11/2019 Mississipi Valley Type Deposit
16/26
Photos of various types of mineralization and rock types in the Lavrion district. a. Multiple crosscutting quartzmolybdenite-
pyrite (Qtz-Mlb-Py) veins in the Plaka granodiorite (PG). b. Hornfels on the margin of the Plaka granodiorite porphyry. c.
Upper Marble (UM) and interbedded schists (S) near the southern margin of the Plaka granodiorite. Massive epidote (E)-bearing skarn is outlined. d. Massive carbonate-replacement ore along the contact of the Kaesariani schists and the Lower
Marble (LM), Jean Baptiste mine (Kamariza area). e. Massive sphalerite (Sph) and calcite (Cal) in carbonate-replacement
ore from Kamariza. f. Intergrown massive pyrite (Py) and sphalerite (Sph) with crosscutting calcite (Cal) veins in massive
ore from Plaka (Villia). g. Brecciated sphalerite-galena ore with clasts of Upper Marble in Vein 80 at the Adami mine. Note
the hornfels on the upper portion of the vein. h. Vein 80 from Adami mine showing bands of galena (Gn), siderite (Sd), and
calcite (Cal).
-
8/11/2019 Mississipi Valley Type Deposit
17/26
Jenis-jenis pengisian (open-space filling)
-
8/11/2019 Mississipi Valley Type Deposit
18/26
A. Crackle breccia with disseminated
sphalerite crystalsin white dolomite
cement, Robb Lake, BC.
B. Mosaic breccia with sphalerite crystalsin white dolomite cement, Robb Lake,
BC.
C. Rubble breccia consisting of variably
altered dolostone fragments and shale
fragments in white dolomite cement.
Note the dolostone fragments with
zebra texture, Robb Lake, BC.
D. Rock-matrix breccia with dolostone,
shale, and white sparry dolomite
fragments in dark grey fragmental
matrix, Robb Lake, BC.E. Aggregates of massive sphalerite
crystals and white sparry dolomite
along small fractures, Pine Point, NWT.
F. Aggregates of colloform sphaleriteand
skeletal galenacompletely replacing
the carbonate, Polaris, Nunavut; scalebar is 1 cm.
-
8/11/2019 Mississipi Valley Type Deposit
19/26
Various ore textures from
Polaris, Nunavut, NWT; scale
bar is 1 cm.
A. Keel ore: sphalerite andskeletal galena are
replacing the carbonate
clasts.
B. Keel ore: crystalline
sphalerite in solution
collapse breccia.C. Ocean zone: Massive
galenaand sparry
dolomite in
pseudobrecciated
carbonate host rock.
-
8/11/2019 Mississipi Valley Type Deposit
20/26
-
8/11/2019 Mississipi Valley Type Deposit
21/26
Peta deposit MVT di seluruh dunia
-
8/11/2019 Mississipi Valley Type Deposit
22/26
.
Distribution of Mississippi Valley-type deposits/districts plotted on a simplified geological map of Canada
(Map D1860A). Districts shown are,Cornwallis;Nanisivik, Pine Point, Prairie Creek, Robb Lake, Monarch-
Kicking Horse, Blende, Bear-Twit, Gayna River, Goz Creek, Gays River, Jubilee, Walton, Newfoundland Zn,Upton, and Esker
-
8/11/2019 Mississipi Valley Type Deposit
23/26
Pine Point
-
8/11/2019 Mississipi Valley Type Deposit
24/26
-
8/11/2019 Mississipi Valley Type Deposit
25/26
Summary of the characteristics of three Mississippi
Valley-type districts
-
8/11/2019 Mississipi Valley Type Deposit
26/26
Terima Kasih
top related