scholarly journals Detailed mineralogical data from hydrothermally altered igneous rocks at Clarke Head, Minas Fault Zone, western Nova Scotia

2019 ◽  
Author(s):  
G Pe-Piper ◽  
J Nagle ◽  
D J W Piper ◽  
B Boucher
Keyword(s):  
Nova Scotia ◽  
Fault Zone ◽  
Igneous Rocks

scholarly journals Dating Hydrothermal Alteration Attending IOCG Mineralization Along a Terrane Bounding Fault Zone: The Copper Lake Deposit, Nova Scotia

10.4138/10090 ◽  
2009 ◽  
Vol 44 (1) ◽  
pp. 146 ◽  
Author(s):  
Daniel. J. Kontak ◽  
Douglas A. Archibald ◽  
Robert A. Creaser ◽  
Larry M. Heaman
Keyword(s):  
Nova Scotia ◽  
Fault Zone ◽  
Hydrothermal Alteration

scholarly journals Two-phase late Paleozoic magmatism (~ 313–312 and ~ 299–298 Ma) in the Lusatian Block and its relation to large scale NW striking fault zones: evidence from zircon U–Pb CA–ID–TIMS geochronology, bulk rock- and zircon chemistry

2021 ◽  
Author(s):  
A. Käßner ◽  
M. Tichomirowa ◽  
M. Lapp ◽  
D. Leonhardt ◽  
M. Whitehouse ◽  
...  
Keyword(s):  
Fault Zone ◽  
Large Scale ◽  
Age Groups ◽  
Spatial Relation ◽  
Shear Zones ◽  
Igneous Rocks ◽  
Geochemical Data ◽  
Late Paleozoic ◽  
Two Phase ◽  
Saxothuringian Zone

AbstractLate Paleozoic (Variscan) magmatism is widespread in Central Europe. The Lusatian Block is located in the NE Bohemian Massif and it is part of the Saxothuringian Zone of the Variscan orogen. It is bordered by two major NW-trending shear zones, the Intra-Sudetic Fault Zone towards NE and the Elbe Fault Zone towards SW. The scarce Variscan igneous rocks of the Lusatian Block are situated close to these faults. We investigated 19 samples from Variscan plutonic and volcanic rocks of the Lusatian Block, considering all petrological varieties (biotite-bearing granites from the Koenigshain and Stolpen plutons, amphibole-bearing granites from three boreholes, several volcanic dykes, and two volcanites from the intramontane Weissig basin). We applied whole-rock geochemistry (18 samples) and zircon evaporation dating (19 samples). From the evaporation data, we selected six representative samples for additional zircon SHRIMP and CA–ID–TIMS dating. For the Koenigshain pluton, possible protoliths were identified using whole-rock Nd-isotopes, and zircon Hf- and O-isotopes. The new age data allow a subdivision of Variscan igneous rocks in the Lusatian Block into two distinct magmatic episodes. The spatial relation of the two age groups to either the Elbe Fault Zone (298–299 Ma) or the Intra-Sudetic Fault Zone (312–313 Ma) together with reports on the fault-bound character of the dated intrusions suggests an interpretation as two major post-collisional faulting episodes. This assumption of two distinct magmatic periods is confirmed by a compilation of recently published zircon U–Pb CA–ID–TIMS data on further Variscan igneous rocks from the Saxothuringian Zone. New geochemical data allow us to exclude a dominant sedimentary protolith for the Koenigshain pluton as supposed by previous investigations. This conclusion is mainly based on new O- and Hf-isotope data on zircon and the scarcity of inherited zircons. Instead, acid or intermediate igneous rocks are supposed as the main source for these I-type granitoids from the Koenigshain pluton.

Early Carboniferous deformation and mineralization in the Cobequid shear zone, Nova Scotia: an 40Ar/39Ar geochronology study

2004 ◽  
Vol 41 (12) ◽  
pp. 1425-1436 ◽  
Author(s):  
Georgia Pe-Piper ◽  
Peter H Reynolds ◽  
Joe Nearing ◽  
David JW Piper
Keyword(s):  
Nova Scotia ◽  
Shear Zone ◽  
Hydrothermal Alteration ◽  
Early Carboniferous ◽  
Fault Zones ◽  
Igneous Rocks ◽  
Pluton Emplacement ◽  
History Of ◽  
Temperature Shear ◽  
Age Determinations

Latest Devonian to Early Carboniferous igneous rocks along the Cobequid shear zone of central Nova Scotia record a complex history of intrusion, volcanism, deformation, and hydrothermal alteration. Twenty new 40Ar/39Ar age determinations have been made on biotite and hornblende separates from rocks that constrain these events. The mafic plutons of the Cobequid shear zone are synchronous with the previously dated granitoid plutons (363–355 ± 4 Ma), with the exception of the younger Folly Lake gabbro (355–350 ± 4 Ma). High temperature shear deformation continued along the Cobequid shear zone during this entire period of pluton emplacement. Several samples from mylonitic and hydrothermally altered rocks with dates ca. 340 Ma indicate renewed movement along the Cobequid shear zone at this time, accompanied by minor magmatism. Younger ∼330–320 Ma ages reflect final movement along the Rockland Brook fault resulting in mid-Namurian uplift of the Cobequid Highlands. Following this regional Alleghenian event, there was no significant motion on the northern faults of the Cobequid shear zone and deformation moved southward to the Cobequid fault and its continuation in the Hollow and Chedabucto fault zones. Hydrothermal alteration, probably driven by a mid-crustal gabbro heat source, was widespread along the Cobequid and Rockland Brook faults in the early Carboniferous, resulting in albitization, potassic alteration, and iron mineralization.

Anatomy of a terrane boundary: an integrated structural, geographic information system, and remote sensing study of the late Paleozoic Avalon-Meguma terrane boundary, mainland Nova Scotia, Canada

1998 ◽  
Vol 35 (7) ◽  
pp. 787-801 ◽  
Author(s):  
T L Webster ◽  
J B Murphy ◽  
S M Barr
Keyword(s):  
Remote Sensing ◽  
Information System ◽  
Nova Scotia ◽  
Geographic Information System ◽  
Fault Zone ◽  
System Analysis ◽  
Geographic Information ◽  
Radar Images ◽  
Meguma Terrane ◽  
Shaded Relief

Remote sensing and geographic information system analysis complimented by geological mapping have resulted in a new interpretation of the Late Carboniferous evolution of the Avalon-Meguma terrane boundary (known as the Minas Fault Zone) in the Canadian Appalachian Orogen. Various images, including optical, radar, and shaded-relief elevation, have been integrated with magnetic and gravity data to compliment mapping in the vicinity of the exposed terrane boundary in mainland Nova Scotia. Throughout much of the region, the style of deformation is typical of dextral motion along the east-west Chedabucto Fault, the most prominent structure in the Minas Fault Zone. Lineament analysis of the shaded-relief elevation and radar images has identified an important lineament trending east-northeast which corresponds to the axial trace of folds that rotate clockwise into parallelism with the Chedabucto Fault. However, in eastern mainland Nova Scotia, the shaded-relief and geophysical images, together with field data, suggest that the Chedabucto Fault was offset by sinistral motion along the north-northwest-trending Country Harbour Fault. Following this event, the region in the vicinity of this offset became a restraining bend during renewed dextral motion along the Chedabucto Fault, resulting in the formation of a positive flower structure represented by the exposure of Early Devonian volcanic and sedimentary rocks in the Guysborough block. The processes described are probably typical of recurrent motions along terrane boundaries.

scholarly journals Isomorphic Substitutions in Apatites From Igneous Rocks of the Chernigiv Fault Zone of the Azov Block of the Ukrainian Shield Using NMR and IRS Data

2018 ◽  
Vol 40 (3) ◽  
pp. 65-84
Author(s):  
O. Kalinichenko ◽  
A. Brik ◽  
K. Ilchenko ◽  
A. Kalinichenko ◽  
T. Kalinichenko
Keyword(s):  
Fault Zone ◽  
Igneous Rocks ◽  
Ukrainian Shield
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