Roberto

Roberto's GeoSite: Hard Rock Geology

School of Geosciences, Monash University, Victoria, Australia

Roberto.Weinberg@monash.edu

 

 

Section index

Migmatites and Magmas

Feldspars

Dykes

Migmatites

Zanskar Shear Zone, Migmatites and Magmas

Igneous Structures

Syn-magmatic deformation

Magma mingling

Interstitial melt extraction from crystallizing magmas

S-type granite

Igneous Layering

Magma Source Processes

 

Structural Geology

Feldspars

Structural Geology Atlas

Faults: Mylonites - Ultramylonites, Pseudotachylites and Gouges

Major Shear Zones: Zanskar, MCT, Karakoram, Pernambuco, Pichao, Alpine Fault

Brittle Faults: Sikkim, Argentina (Cordoba), Alpine Fault (NZ)

Structural Geology and Tectonics

Fracture Surface

Liptrap turbidites: sedimentary structures and folds

Mineral deposits

Granite alteration around fractures

Sedimentary and Volcanic Structures

Sedimentary Structures

Liptrap turbidites: sedimentary structures and folds

Tethys Sedimentary Sequence

Volcanoes, Volcanic Rocks and Textures

 

 

Other

Numerical models

Sand patterns

Mineral deposits

Petroglyphs

 

 

 

 

 

 

Structural Geology: Photographic Atlas


 

Feldspars


Feldspar: phenocrysts, blasts and clasts

Dykes


Basaltic feeder dyke to Parana Basin basalts at Pinheiras, Santa Catarina, Brazill


Composite dykes, Zimbros Beach, Santa Catarina, Brazil


Magma extraction dykes in diatexite, Itapema, SC, Brazil


Spotted dyke, Shyok, Ladakh


Magma Mingling in Cross-Cutting Dykes Ladakh Batholith, Himalayas

 

 


Zanskar
Zanskar Shear Zone, Migmatites and Magmas


Zanskar Shear Zone: the South Tibetan Detachment in Zanskar


Tourmalinization Related to Leucogranites, Zanskar, NW India


Timing of Leucogranite Intrusion, Zanskar Shear Zone


Deformation and Melting in Reru Valley, Zanskar, NW India


Migmatites of Reru Valley, Zanskar, NW India

 

 


Igneous Structures


Orbicular Granite, Youanmi Terrane, Yilgarn


Tonalite intrusion into marble, Matarazzo quarry, South Brazil


Composite Enclaves and Xenoliths in Granite, Kangaroo Island, SA

megacryst
Megacrystic granites on Kangaroo Island

megacryst
Magma Mingling in Migmatite Source, Kangaroo Island


Magma Mingling: Tynong Pluton, Lachlan Fold Belt


Tourmalinization Related to Leucogranites, Zanskar, NW India


Magma Hybridization, Sierra de Copacabana, Argentina


Finland, 100 years of migmatites - in Sederholm's footsteps


Pegmatitic Granite / Gabbro Mingling, Campina Grande


Magma Mingling and Shearing in Corsica


Fangshan Pluton, North China Craton


Enclaves of Fangshan Pluton, North China Craton


Syn-magmatic deformation, Guojialing, Shandong, China


Spotted dyke, Shyok, Ladakh

branching
Shyok Granites


Ductile Fractures in Geological Materials


Melt Extraction Structures from Mush, Rio de Janeiro International Airport


Syn-Magmatic Deformation and Melt Extraction, Alagoinhas Pluton, Borborema Province


Syn-Magmatic Shear Zones, Alagoinhas Pluton, Borborema Province


Strain Localization into Dyke, Prata Pluton, Borborema Province


Agmatite, Prata Pluton, Borborema Province


Structural Igneous Petrology, Borborema Province


Uncommon Magmatic Structures in Borborema Province 2


Uncommon Magmatic Structures in Borborema Province 3


Uncommon Magmatic Structures in Borborema Province 4


Sillimanite-Cordierite Tonalite, Hidaka Metamorphic Belt, Hokkaido, Japan


K-feldspar Deformed in Mush


Layered Cumulate in Granitoid, Ladakh


Magma Mingling in Cross-Cutting Dykes Ladakh Batholith, Himalayas


Stoping of Country Rock by S-type Granite and Late Tortuous Dykes, Czech Republic


Himalayan S-type Granite: Nuptse, Khumbu, Nepal


Twigs: Magma Flow Analogue


Sheared Vesicles: Rheological Implications


Igneous Flow Banding, St Peter Suite


Physical Disruption and Assimilation of Granite Xenoliths, St Peter Suite


Magma Mingling, St Peter Suite


Pegmatite Disruption and Assimilation, St Peter Suite


Magma Evolution, St Peter Suite

 

 


 

Migmatites

net-veining
Extraction of Magmas in Migmatite Source, Kangaroo Island

megacryst
Magma Mingling in Migmatite Source, Kangaroo Island


Extraction Dykes from Diatexite Source, Dom Feliciano Belt, Brazil


Disaggregation and syn-anatectic deformation of diatexite, Dom Feliciano Belt, Brazil


Migmatites associated with the Guachacorral Shear Zone, Sierras de Comechingones, Argentina


Magma Mingling in Migmatites at Granite Source, Kangaroo Island, SA

leucosome
Ovejeria Migmatite: Remelted Granite? Sierra de Quilmes, Argentina


Banded Orthogneiss Migmatites, Kadanie, Czech Republic

leucosome
Anatexis of the Higher Himalaya Crystalline, Sikkim, India


Finland, 100 years of migmatites - in Sederholm's footsteps


Reru Valley Migmatites: Two Melting Phases of Water-Fluxing Anatexis


Leucosomes in Migmatites from Malung Thokpo, Zanskar, High Himalayas


Peritectic Hornblende: water-assisted melting of amphibolites, Ladakh


Peritectic Hornblende: water-assisted melting of intermediate calc-alkaline rocks, Ladakh Muglib


Antiform preservation, synform destruction: anatexis in Ladakh


Spotted dyke, Shyok, Ladakh


Folding and Disaggregation of Migmatites: Karakoram Shear Zone, Ladakh, NW India


Disharmonic, ptygmatic folds, Karakoram, Ladakh, India


Agmatite, Prata Pluton, Borborema Province


Santa Quiteria Complex, Ceara


Stoping of Country Rock by S-type Granite and Late Tortuous Dykes, Czech Republic


Broken Hill - Diatexite Hill


Broken Hill - Melt-Assisted Transposition, Monuments area


Timing of Melting, Broken Hill

 

 


 

Magma mingling

megacryst
Magma Mingling in Migmatite Source, Kangaroo Island


Magma Mingling in Migmatites at Granite Source, Kangaroo Island, SA


Finland, 100 years of migmatites - in Sederholm's footsteps


Pegmatitic Granite / Gabbro Mingling, Campina Grande


Magma Mingling During Shearing in Corsica


Magma Mingling in Cross-Cutting Dykes Ladakh Batholith, Himalayas


Enclaves of Fangshan Pluton, North China Craton


Spotted dyke, Shyok, Ladakh


Uncommon Magmatic Structures in Granites of the Borborema Province


Magma Mingling: Tynong Pluton, Lachlan Fold Belt


Magma Mingling: Bingie Point, Lachlan Fold Belt


Magma Hybridization, Sierra de Copacabana, Argentina


Magma Mingling, Saint Peter Suite

 


 

Igneous Layering


Igneous Flow Banding


Layered cumulates, Ladakh Batholith


Orbicular Granite, Youanmi Terrane, Yilgarn

 


 

Magma Source Processes


Composite Enclaves and Xenoliths in Granite, Kangaroo Island, SA


Magma Mingling in Migmatites at Granite Source, Kangaroo Island, SA


S-type granites, Racov and Vanov, Eastern Czech

 


Extraction Dykes from Diatexite Source, Dom Feliciano Belt, Brazil


Extraction Dykes from Diatexite Source, Dom Feliciano Belt, Brazil


Magma Transfer Zone, Rio Grande do Sul, Brazil

 


 

Interstitial melt extraction from crystallizing magmas


Melt Extraction Structures from Mush, Rio de Janeiro International Airport


Syn-Magmatic Deformation and Melt Extraction, Alagoinhas Pluton, Borborema Province


Syn-Magmatic Shear Zones, Alagoinhas Pluton, Borborema Province


Uncommon Magmatic Structures in the Borborema Province 3


Syn-magmatic deformation, Guojialing, Shandong, China

 

 


 

S-type granite


Zanskar Shear Zone: the South Tibetan Detachment in Zanskar


Tourmalinization Related to Leucogranites, Zanskar, NW India


Timing of Leucogranite Intrusion, Zanskar Shear Zone


Himalayan S-type Granite: Nuptse, Khumbu, Nepal


Sillimanite-Cordierite Tonalite, Hidaka Metamorphic Belt, Hokkaido, Japan


S-type Granite Stoping and Late Tortuous Dykes, Czech Republic, Racov and Vanov, Eastern Czech

 

 


 

Mylonites - Ultramylonites, Pseudotachylites and Gouges


Pseudotachylites in ultramylonites, Sierra de Quilmes, Argentina


Jiao Jia Fault Gouge, Jiaodong gold mines, China


Ultramylonites, El Pichao, Argentina


Shear Zones of the Borborema Province


Ultramylonites, Teixeira Pluton, Borborema Province, NE Brazil


Brittle K-feldspar Deformation During Shearing: Quebrada Belen, Catamarca


Megacrysts Deformation: a Comparison


Main Central Thrust: Parvati Valley, Himachal Pradesh


Alpine Fault, New Zealand


Quartz Porphyroclast Mylonites, Boc Granite, Czech Republic


Amphibolite Rheology in Pelitic Mylonite, Cordoba, Argentian

 

 


 

Major Shear Zones


Ultramylonites, El Pichao, Argentina


Pernambuco Shear Zone and more, Borborema Province


Karakoram Shear Zone


Zanskar Shear Zone: the South Tibetan Detachment in Zanskar


Brittle K-feldspar Deformation During Shearing: Quebrada Belen, Catamarca


Megacrysts Deformation: a Comparison


Main Central Thrust: Parvati Valley, Himachal Pradesh


Alpine Fault, New Zealand

 

 


 

Brittle Faults


Nathula Pass Fault, Sikkim Himalayas


Sierra de Comechingones, Cordoba, Argentina (being built)


Alpine Fault, New Zealand

 

 


 

Structural Geology and Tectonics


Fracture surfaces


Cape Liptrap turbidites, Victoria: sedimentary structures and deformation


Ultramylonites, El Pichao, Argentina


Tectonic contact of the Karakoram Batholith, Ladakh


Zanskar Shear Zone: the South Tibetan Detachment in Zanskar


Fangshan Pluton, North China Craton


Enclaves of Fangshan Pluton, North China Craton


Boudins in psammites, High Himalaya Crystalline, Alakhnanda


Shear Zones of the Borborema Province


Antiforms in Anatexite, Muglib


Ductile Fractures in Geological Materials

irregular folds
Disharmonic, ptygmatic folds, Karakoram, Ladakh, India


Synkinematic magmatism on the Karakoram Fault, Ladakh: a criticism of Phillips et al., 2004, EPSL


Ultramylonites, Teixeira Pluton, Borborema Province, NE Brazil


Strain Localization into Dyke, Prata Pluton, Borborema Province


Agmatite, Prata Pluton, Borborema Province


Syn-Magmatic Shear Zones, Alagoinhas Pluton, Borborema Province


Brittle K-feldspar Deformation During Shearing: Quebrada Belen, Catamarca


Megacrysts Deformation: a Comparison


Broken Hill - Diatexite Hill


Broken Hill - Melt-Assisted Transposition, Monuments area


Santa Quiteria Complex, Ceara


Soft Sediment Structures: Japan


Curved Slickenfibers, Yilgarn Craton


Geology of East Timor


Cosmo Howley Gold Deposit, NT, Australia: pyritization during folding


Eldee, Broken Hill: Microstructural development


Gold and Shear Zones in Yilgarn Craton

 

 


 

Volcanoes, Volcanic Rocks and Textures


White Island volcano, New Zealand


Basalt intrusion into soft sandstone, Cape Bridgewater, Victoria


Sheared Vesicles: Rheological Implications


Vesicle Structures in Newer Volcanic Basalts: Melbourne Pavement


Volcanic-Soft Sediment Features, Bunga Beds, Aragunnu, Victoria: Site Not Available


 

Sedimentary Structures


Silica Concretions, Paleoproterozoic Wu Mi Shan Fm, North China Craton


Soft Sediment Structures, Japan


Cape Liptrap turbidites, Victoria: sedimentary structures and deformation


Tethys Sedimentary Sequence, Zanskar


Primary and Soft Sediment Structure, Kangaroo Island


Volcanic-Soft Sediment Features, Bunga Beds, Aragunnu, Victoria: Site Not Available


Sedimentary Recumbent Folds in Sandstone, Tasmania


Deformed Primary Structure, High Himalaya Crystalline, Alakhnanda

 

 

 


Petroglyphs


Petroglyphs, Ladakh

 


 

Ore deposits


Ok Tedi, porphyry copper deposit, Papua New Guinea


Ok Tedi Breccias, porphyry copper depost


Cosmo Howley Gold Deposit, NT, Australia: pyritization during folding


Gold and Shear Zones in Yilgarn Craton


Leonora gold province, Yilgarn: early extension


Jiao Jia Fault Gouge, Jiaodong gold mines, China


 

Granite Alteration


Granite alteration, Laizhou town, Shandong Province, China

 


 

Sand Patterns


Little Sahara, Kangaroo Island


Mungo sands, Mungo National Park, NSW, Australia


Sand dunes in Hundar, Ladakh, India

 


 

Numerical models


Numerical Fluids


Pressurized Magmatic Fluid Influx


Pore Pressure Diffusion


Shear Zone and Pumping


Strain Incompatibility and Simple Shearing: Implications for Gold and Granite Emplacement


Shear Bands: the Role of Friction and Dilation Angles


Shear Bands: Two Layer Models