stratigraphic legend geologic map of the yanacocha ... · granja porcon quecher la quinua dome co...
TRANSCRIPT
Plate 1Geologic Map of theYanacocha District
Cajamarca, PeruGeologic mapping of the central part of the Yanacocha District conducted prior to 2001: D. Abarca, J. Barreda, R. Bartra, E. Calderón, M. Changanaqui,J. Edwards, J. Escalante, B. Harvey, T. Klein, B. Leach, C. Loayza, A. Longo, S. Myers, R. Pinto, A. Quiroz, M. Rutti, and C. Velasco.
This geologic map was completed and compiled as part of anOregon State University doctoral dissertation (Longo, 2005)
Kls Limestone and marls Cajamarca Fm. and Pulluicana-Quillquiñán Groups
Quartzite and shales Goyllarisquizga GroupKq
Cretaceous Sedimentary Rocks
Calipuy Group Volcanic Rocks
Atazaico Andesite Lava and Dome Rocks
Colorado Pyroclastic and Flow-Dome Sequence
Azufre Andesite-Dacite Lava and Dome Rocks
San Jose Ignimbrite and Dome Sequence
Ted - early hb-bi dacite intrusionsEarly Quilish-Exaltado Dacite
Typ -Yanacocha feldspar porphyry and diatreme breccia
Coriwachay Dacite
La Quinua Sediments (Pliocene ?)Tl - Tu�aceous Lacustrine Sediments
Yanacocha gravels (Pleistocene)Qg - �uvial and glacial deposits
Tulx - upper laminated rocks
Tcd - Corimayo-Quilish-Punta Negra dacite domes
Typq -
Tcyd -
Tbxh - Yanacocha phreatic-hydrothermal breccia
Tnrd - Negritos rhyolite domes
Tnri - Negritos rhyolite ignimbrite
Tusjd - Upper San Jose px-hb dacite dome rocks
Tmsjd - Middle San Jose hb-bi dacite dome rocks
Tlsjd - Lower San Jose px-hb dacite dome rocks
Tusj - Upper San Jose px-hb dacite spatter ignimbrite
Tmsj - Middle San Jose hb-bi andesite-dacite ignimbrite
Tlsj - Lower San Jose px-hb andesite-dacite ignimbrite
Tmlx - Middle laminated rocks
Tuphad - upper px-hb andesite-dacite dome rocks
Tupha - upper px-hb andesite-dacite lava dominant rocks
Tmmp - hb andesite porpyritic lavas and intrusions
Tmmi - Maqui Maqui Ignimbrite (inc. Cori Coshpa tu�)
Tllx - Lower laminated rocks
Tlphad - lower px-hb andesite dome rocks
Tlpha - lower px-hb andesite lava dominant
Tpt - Peña de Leon tu� (eastern side)
Tcfd - Cerro Fraile pyroclastic sequence
Tlalc - Chaupiloma lower andesite lahar sequence
Tlalt - Tual lower andesite lahar sequence
Tha - Huambo Cancha andesite
Tmcv - Minas Congas volcanic rocks (eastern side)
Ro
ck
s o
f t
he
Ya
na
co
ch
a V
olc
an
ics
Stratigraphic Legend
Low
er M
ioce
neM
idd
le M
ioce
ne
Up
per
Mio
cen
e
altered porphyry rocks and diatremes(no quartz phenocrysts)
Yanacocha Lake rhyolite-dacite domedikes and diatreme
Yanacocha quartz dacite porphyry plugs and diatreme
and intrusions
Unmapped areas
fault well locatedpossible faultfault contact ~30mfault contact ~15mprominent circularfeature
possible contactcontact ~30mcontact ~15mcontact ~5mcontact welllocated
ContactsFaults
Structural attitudes omitted for clarity (see Longo, 2005)
Limits of the argillic and advanced argillic alteration in outcrop
Limits of weak argillic and advancedargillic alteration
Limits of alteration concealed or buried
Yanacocha
6ºS
80
ºW
Index Map of Acknowledgements
Peru
7650
00E
7850
00E
9225000N2
5
9
81
4637
9240000N
9235000N
9230000N
9225000N
9220000N
9215000N
7600
00E
7650
00E
7700
00E
7750
00E
7800
00E
7850
00E
7550
00E
0 5
Kilometers
�
Tcfd
Tcfd
Tcfd
Tcfd
Tcfd
Tcfd
TcfdTcfd
Tcfd
Tcfd
Tcfd
Tha
Tlalt
Tlalt
TlaltTlalt
Tlalt
TlalcTlalc
Tlalc
Tlalc
Tlalc
Tlalc
Tlalc
Tlalc
Tpt
Tpt
Tpt
Tmcv
Kls
Kls
Tpt
KlsKls
Kq
Kq
Ted
Ted
Ted
Tl
Tlpha
Tlpha Tlpha
Tlpha
Tlpha
Tlpha
Tlpha
Tlpha
Kq
Tlphad
Tlphad
Tlphad
Qg
Qg
Qg
TuphadTuphad
Tmlx
Tlsj?
Tmsj
Tusj
Tusj
TlsjTlsj
Kls
Tmsj
Tmsj
Tmsj
Tnri
Tmmi
Tmmi
Tmsj
Tupha
Tuphad
Tuphad
Tcd
Tcd
Tupha
Tlsjd
Tusjd
TmsjdTuphad Chaquicocha Gold Deposit Outline
Cerro Regalado
Quilish
Tual
Chaupiloma
Huambo Cancha
Cerro Fraile
Antibuyoc
Cerro Negro
El Arco
BarrancoTatiana Pachanes
Sorpresa
China Linda
Elita
Ocucho
Alto Machay
Los Pinos
Exaltado
Cerro Atazaico
HornamoSugares
Maqui Maqui
Co Yanacocha
Pampa LargaColorado Graben
Pabellon
Cori Coshpa
Punta Negra
Arnacocha
Corimayo
Carachugo
Chaquicocha
Azufre
Pampa Cerro Negro
Negritos
La Quinua Graben
Pampa CorimayoSan Jose
Baul
Machay
Sacsha
sur
Cajamarca
Otuzco Trough
Combayo
Otuzco
Ventanillasde Combayo
Quebrada Honda
La Quinua Facility
Lake district
Paquerumi-Huacataz
Cerro Collotan
Stratacone
glacial deposits
Kupfertal
norteEncajon
Tapado
Granja Porcon
QuecherLa Quinua dome
Co Cantaalta Combayo - place name of locality (see text)