 | | Journal (article/letter/editorial) | | magma-crust interaction, Central Andes, southern Peru Barbara A. Barreiro 1,, and Alan H. Clark 2 I Department...Jurassic to Recent age in Moquegua and Tacna Departments, southernmost Peru, to clarify the petrogenesis of...granodiorites from the Ilo and Toquepala intrusive complexes, and seven samples of Toquepala Group subaerial volcanics...inliers of Precambrian rocks occur in the Moquegua-Tacna transect (Fig. 1). TABLE 1 2. General geological...geological and geomorphological history of Moquegua and Tacna Departments (modified after references 22, 23, 25 |  | Quang, C. X., Clark, A. H., W. Lee, J. K., Hawkes, N. (2005) Response of Supergene Processes to Episodic Cenozoic Uplift, PedimentErosion, and Ignimbrite Eruption in the Porphyry Copper Province of Southern Peru. Economic Geology, 100 (1) 87-114 doi:10.2113/100.1.0087 | Journal (article/letter/editorial) | | and Ignimbrite Eruption in the Porphyry Copper Province of Southern Perú CHAN X. QUANG, ALAN H. CLARK...area surrounding the Cuajone, Quellaveco, and Toquepala deposits (ca. 17° S) is revised and extended northwestward...were probably active in the Cuajone-Quellaveco-Toquepala district. Slow erosion and the accumulation of...for much of the upgrading of the Cuajone and Toquepala deposits and thr Quellaveco prospect, which are...during the Incaic orogeny. Middle Miocene (≤14.2 Ma biotite age) Chuntacala Formation flows protected the Cuajone |  | Clark, Alan H., Farrar, Edward, Kontak, Daniel J., Langridge, Robert J., Arenas F., Mario J., France, Lynne J., McBride, Sandra L., Woodman, Priscilla L., Wasteneys, Hardolph A., Sandeman, Hamish A., Archibald, Douglas A. (1990) Geologic and geochronologic constraints on the metallogenic evolution of the Andes of southeastern Peru. Economic Geology, 85 (7) 1520-1583 doi:10.2113/gsecongeo.85.7.1520 | Journal (article/letter/editorial) | | MetallogenicEvolution of the Andes of Southeastern Peru ALANH. CLARK,EDWARDFARlIAR,DANIELJ. KONTAK,*ROBERT... GedlogoConsultor,Caminosdel Inca 698, Lima 33, Peru LYNNEJ. FRANCE,**SANDRA L. MCBRIDE,PRISCILLA L...post-Paleozoic metallogenicevolutionof southeastern Peru is clarifiedon the basisof the stratigraphic an...Arc in the interval 52.15 (Cuajone)to 57.1 Ma (Toquepala)asthe terminalstagein the evolutionof the subaerial...contiguous centralAndeantransects, southeastern Peru differsmarkedlyfrom other areasof the countryin |  | Simmons, A. T., Tosdal, R. M., Wooden, J. L., Mattos, R., Concha, O., McCracken, S., Beale, T. (2013) Punctuated Magmatism Associated with Porphyry Cu-Mo Formation in the Paleocene to Eocene of Southern Peru. Economic Geology, 108 (4) 625-639 doi:10.2113/econgeo.108.4.625 | Journal (article/letter/editorial) | | Formation in the Paleocene to Eocene of Southern Peru* ADAM T. SIMMONS,1,** RICHARD M. TOSDAL,1,† JOSEPH...California 94305 Peru Copper Corporation, Casilla 303, Toquepala, Peru 4 Southern Peru Copper Corporation...Cuajone, Peru 5 AngloAmerican Exploration, Lima, Peru Abstract The Paleocene to Eocene southern Peru porphyry...porphyry Cu-Mo deposits at Cuajone, Quellaveco, and Toquepala. Ten new zircon U-Pb Sensitive High Resolution...MicroprobeReverse Geometry (SHRIMP-RG) ages for Cuajone and Toquepala, together with published ages for Quellaveco, |  | | Journal (article/letter/editorial) | | Potassium-Argon Dates from Toquepalaand Michiquillay, Peru A. W. LAUGHLIN, P. E. DAMON, AND B. N. WATSON Abstract...coppermineralization in Peru. A maximumage of 58.7----1.8 m.y. (Laramide) is assignedto the Toquepala depositand at...THREEsamplesspatiallyrelatedto porphyrycopper depositsin Peru have recentlybeen dated by the K-Ar method(Fig....catea predetermineif sucha relationshipexistsin Peru. cisionof 0.74% s.d. • ContributionNo. 147, Program...a diorite fromtheToquepala districtin southern Peru. Richard and Courtright(9) statethat this diorite |  | Quang, C. X., Clark, A. H., Lee, J. K. W., Guillen B., J. (2003) 40Ar-39Ar AGES OF HYPOGENE AND SUPERGENE MINERALIZATION IN THE CERRO VERDE-SANTA ROSA PORPHYRY Cu-Mo CLUSTER, AREQUIPA, PERU. Economic Geology, 98 (8) 1683-1696 doi:10.2113/gsecongeo.98.8.1683 | Journal (article/letter/editorial) | | VERDE-SANTA ROSA PORPHYRY Cu-Mo CLUSTER, AREQUIPA, PERU CHAN X. QUANG,† ALAN H. CLARK, JAMES K.W. LEE, Department...Queen’s University, Kingston, ON K7L 3N6, Canada AND JORGE GUILLÉN B. Sociedad Minera Cerro Verde S.A., Asiento...Avenida Alfonso Ugarte 304, Casilla 299, Arequipa, Peru Abstract The contiguous Cerro Verde and Santa Rosa...American plate boundary for at least 800 km in southern Peru and northern Chile (Fig. 1a). Centered at latitude...U-Pb zircon (61 ± 1 Ma: Mukasa, 1986) and KAr biotite (56-59 ± 2 Ma: Estrada, 1978) dates for the porphyry |  | | Journal (article/letter/editorial) | | p. 321-345. Central Balabac Island, Palawan Province, Philippines: Ecoa. G•.o•..,v. 58, p. 107-130...involvedthe meaningof and breccias from the Granisle Mine in centr British Columbia. These figuresserveto...chalcopyrite-bearingquartz veins. Granisle Mine, B.C. descriptionsof Braden, Toquepala, and Cananea (Howell and Molloy...bornite- and chalcopyrite-coatedfractures. Granisle Mine, B.C. FIG. 5. Two intermineral porphyry intrusions...oldest porphyry truncates are not shown. Granisle Mine, B.C. 1248 SCIENTIFIC COMMUNIC•tTION Genesisof |  | | Journal (article/letter/editorial) | | porphyries,are locally porphyry, more properly termed biotite latite por- gradational anddifficultto placewithina...two roughlyequal- pyritewithlessthan5% kaolin,biotite,or K-feldspar,and "potassic" is suggested (Guilbertand...Sericitized brn-grnalt'n biotite,K-spar,ser. Fresh or recrystallized ta sucrose Biotite Chlor,zois, car, leucoxene...(kaol} • •A•.kool brn-grngranules,+ chlorite Biotite,+ chlorite•rutile Pyritized A A A=A' ,a•a <-...varieties of much younger biotite ondary K-feldspar and secondary biotite, even porphyries. The. Oracle |  | | Book | | Andes W. S. Pitcher 152 The Coastal Batholith of Peru MP. Atherton 168 Lead isotope systematics in...batholithic rocks of the Western and Coastal Cordilleras, Peru S.B. Mukasa and G.R. Tilton 180 Geochemical characteristics...evolution of the Cordillera Oriental, southeastern Peru D.J Kontak, A.M. Clark and E. Farrar 203 Geochemical...(Northern Volcanic Zone, NVZ: ea. 5°N-2°S), south Peru-north Chile (Central Volcanic Zone, CVZ: ea. 16-28°S)...the Andes may be divided into five segments. In Peru (ea. 2-15°S) and central Chile (ea. 27-33°S), the |  | | Journal (article/letter/editorial) | | LONGEVITY OF PORPHYRY COPPER FORMATION AT QUELLAVECO, PERU RICHARD H. SILLITOE,1,† AND JAMES K. MORTENSEN2...Quellaveco porphyry copper-molybdenum deposit in southern Peru spans several phases of quartz monzonite porphyry...Quellaveco porphyry copper-molybdenum deposit in southern Peru, including the approximate duration of copper introduction...assigned to the Late Cretaceous to early Paleocene Toquepala Group (Estrada, 1975; Guerrero and Candiotti,...are made up of abundant plagioclase, quartz, and biotite, plus scattered K-feldspar and hornblende, all |  | Kamenov, G., Macfarlane, A. W., Riciputi, L. (2002) Sources of Lead in the San Cristobal, Pulacayo, and PotosiMining Districts, Bolivia, and a Reevaluation of Regional Ore Lead IsotopeProvinces. Economic Geology, 97 (3) 573-592 doi:10.2113/gsecongeo.97.3.573 | Journal (article/letter/editorial) | | this basis we identify a new ore lead isotope province extending from San Cristobal northward across...eastern Altiplano and into southern Perú. This province is coincident with but smaller than the extent...mineralizing event. Ore deposits in the northern part of province IV formed before the thickening of Andean crust...(Fig. 1, inset). Province I comprises the coastal volcanic arc of Perú and Chile, province II includes the...573 574 KAMENOV ET AL. 19°S Peru Pro vin ce II Pro vin ce I Province III POTOSI Bolivia 98M013 98M014 |  | | Journal (article/letter/editorial) | | Oligocene-Miocene Crucero Supergroup of the southern Peru Inner Arc domain provide a previously unavailable...the magmatic and hydrothermal activity of the Toquepala superunit of the Coastal Batholith. Collision...zone separating the sites of anatexis in southern Peru and northern Bolivia. This is inferred to represent...subdivisions of the Andean orogenic belt in southern Peru and contiguous northern Bolivia. The approximate...westerly of these constitutes the 6000- to 8000-m-deep Peru-Chile trench and the forearc slope (Llanuras Costaneras) |  | | Book | | Potteriics, Chile . 4 ¢ Section Through Arequipa, Peru 5 ¢ Section Through Potrerillos, Chile . ; 6...Rego Chile : 7 ¢ Michiquillay Regional Geology (Peru) . 8 © Structure at Chuquicamata, Chile . 9 ¢ Surface...Morococha, Peru, including Toro Mocho Area . 13 © Structural Outline of Toquepala, Peru . ‘ 14 ¢...¢ Detailed Surface Geologic Map of Toquepala . 15 16 17 18 19 ¢ © ¢ ¢ ¢ Index Map (Appalachian Orogen)...Plutonic Belt, ies 27 @ Geology of the Kobuk-Koyukuk Province (Alaska). 28 © Interior Belt (Alaska). 3 ; , |  | | Journal (article/letter/editorial) | | separatesthe Colorado Plateau from the Basin and Range Province. The terrane is essentiallya complexof igneousand...to the northeastand the currentlyactive Iron King mine near Humboldt, about 15 miles to the east (Fig....GeologicalSurvey open file report on the Loma Prieta mine. ,4cknowled#ments.--Partof this paper is taken from...present as one large unit near the Boston-Arizona mine and as small xenolithsand roof pendantsthroughoutthe...St•l•e and Dip of • Strike •d FollatJon • • • Mine Graded •i(l• SCALE i• T • / t t ?/ /' /' |  | | Journal (article/letter/editorial) | | Superieure de Geologie, Nancy, France puis Minero Peru, Casilla 4332, Lima, P6rou Les ~ges K-Ar des roches...d'~ges pal~oc~nes ~oc~nes dans les districts de Toquepala (Laughlin et al., 1968), de Cerro Verde (Stewart...en discordance par les formations du groupe de Toquepala: 300 m de du porphyre cuprif~re de Quellaveco...ouest et SW. Le mingral ferro-magn6sien est la biotite; la hornblende est tr~s rare et, quand elle est...(hasification du plagioclase et enrichissement en biotite), mais ils peuvent ~tre localement intrusifs. D'importantes |  | | Journal (article/letter/editorial) | | dSOM.dTIC COPPER THE C.dLZ.dD.d MINE, W. MINER.dLIZ.dTION PERU C. STOLL The Calzadacoppermineis...from a conglomeratebed at least 6 m thick. At the mine,a maximumstratigraphic thickness of 70 m of light...near Casapalca.No intrusiverocksare exposed at the mine. The conglomerates and interbedded quartzitesare...calcite, with smaller quantitiesof garnet,epidote,biotite,sericite,penninite,speculariteand coarse pyriteand...replaced by spotsof garnetwith lesserquantitiesof biotite, epidote,sericiteand calcite. One suchbed has. |  | | Journal (article/letter/editorial) | | intrusions mineralization in western North America, Peru, and alongthe westernslopesof the CordilleraOccidental...uplift and erosionof pre---0.29 m.y. from the biotite granodioritecould becomes mineral cover than one...opportunitiesto the explorationist. Michiquillay,Peru gave a K.-Ar date of 20.6-----0.6 BARRY N. WATSON...Potassium-argondates from Toquepala and Michiquillay, is the seeminglack of secondary enrichment.None Peru: Ecoa. GEm...Miiller-Kahle, E., and Damon, P. E., 1970, K-Ar age of a biotite granodiorite associatedwith primary Cu-Mo minto |  | | Report (issue) | | silicate and oxide minerals are quartz, K-feldspar, biotite, muscovite (sericite), magnetite, chlorite, anhydrite...on the form of the phenocryst. Ragged-appearing biotite commonly occurs in this manner. Linear arrays of...quartz-alkali feldspar intergrowths and ragged biotite (with lesser apatite and magnetite) (Harris and...most common alteration minerals are K-feldspar, biotite, muscovite (sericite), albite, anhydrite, chlorite...pyroxene, epidote, quartz, actinolite, chlorite, biotite, calcite, dolomite, K-feldspar, and wollastonite |  | | Journal (article/letter/editorial) | | of the orebody and its environs. Bedrocknear the mine consistsmostly of extensivevolcanic flows and i...e. The most prominent structural feature in the mine area is the Braden Pipe•a circular, downward-tapering...developmentof plentiful fine-grainedsecondary biotite throughout the andesire within the orebody. Metallization...porphyry-type deposits. INTRODUCTION THE E1 Teniente Mine of the Braden Copper Company is on the western flank...three-yearperiod, surface geologyin the vicinity of the mine was mappedon a scaleof 1:2,500, accessibleundergroundworkingswere |  | | Journal (article/letter/editorial) | | Iron Oxide-Copper-Gold Deposit, Central Coast of Peru ANTOINE DE HALLER,†,* University of Geneva, Mineralogy...Manuel Roaud y Paz Soldán 364, San Isidro, Lima 27, Peru Abstract Raúl-Condestable is a >32 million metric...Ma. All these rocks contain hornblende and/or biotite but no pyroxene and correspond to silica- and waterrich...tonalite intrusions. It consists of a core of biotite alteration and quartz stockwork, † Corresponding...oxide-copper-gold deposit in the central coast of Peru. The location of the studied area (Fig. 2) is shown |  | | Journal (article/letter/editorial) | | 150 X 150 >600 Angularto sub- Absent rounded Peru San Pedro de 10 to >50% rounded Granodiorite...Aiken, 1982) and Toquepala, exhibit a greater variety of texturesthan isolated Peru (ZwengandClark, 1984)...pyrite, molybdenite Principalgangue minerals Biotite,chlorite, Age relativeto porphyrydeposit Largelypremineral...Molybdenite,pyrite Quartz Pyrite, chalcopyrite Biotite, garnet, an- Early intermineral Ore largelyrestrictedto...Cummings(1982) Pyrite, chalcopyrite,molybdenite Quartz, biotite Early mineral High-gradeore West and Aiken (19S2) |  | | Journal (article/letter/editorial) | | deposits and prospects in northern Chile and southern Peru cited in the text. The easterly upper Eocene to...and contiguous northwest Argentina and southern Peru (Fig. 1), exhibit hypogene Cu grades of at least...which dominate the Pacific piedmont in southern Peru and northern Chile, were generated rapidly under...multistage enrichment profile of the Toquepala porphyry deposit, southern Peru (Anderson, 1982; Clark et al....with the erosion surfaces in the wider Atacama province (e.g., Clark et al., 1990a). Subsequently, in | | Cunningham, Charles G., Zappettini, Eduardo O., Vivallo S., Waldo, Celada, Carlos Mario, Quispe, Jorge, Singer, Donald A., Briskey, Joseph A., Sutphin, David M., Gajardo M., Mariano, Diaz, Alejandro, Portigliati, Carlos, Berger, Vladimir I., Carrasco, Rodrigo, Schulz, Klaus J. (2008) Quantitative Mineral Resource Assessment of Copper, Molybdenum, Gold, and Silver in Undiscovered Porphyry Copper Deposits in the Andes Mountains of South America. Open-File Report 2008-1253. US Geological Survey doi:10.3133/ofr20081253 | Report (issue) | | geological surveys of Argentina, Chile, Colombia, Peru, and the United States Quantitative Mineral Resource...E.O., Vivallo S., Waldo, Celada, C.M., Quispe, Jorge, Singer, D.A., Briskey, J.A, Sutphin, D.M., Gajardo...Carrasco Peru INGEMMET Jorge Quispe Jointly publi shed by: Country Argentina Chile Colombia Peru United...(SEGEMAR), Chile (SERNAGEOMIN), Colombia, (INGEOMINAS), Peru (INGEMMET), and the United States (USGS) iii Probability...(SEGEMAR), Chile (SERNAGEOMIN), Colombia, (INGEOMINAS), Peru (INGEMMET), and the United States (USGS) v Figure |  | | Journal (article/letter/editorial) | | porphyry copper of Cajamarca Department, northern Peru (see Fig. 1 for location) well fits the model for...for the intrusion. A section drawn normal to the Peru trench would reveal the speculative possibility...on it outside of Michiquillay. The hornblende biotite quartz monzonite porphyry exposed at Michiquillay...subhedral crystals of quartz, hornblende, feldspar and biotite set in a fine grained matrix. Alteration throughout...occurs as a minor constituent. Orthoclase and biotite have been identified only as rare minerals in the |  | | Journal (article/letter/editorial) | | completelyobliterate any original rock textures. Some secondary biotite is also formed. A concentricarrangementof sericiticand...fragmentstogether,like the "daciteagglomerate"at Toquepala,Peru. Fracturing is commonin aphanites,commonlyas...some coppersulfides may be deposited, as at Toquepala, Peru. This marksthe mainperiodof pyritizationand...the brecciation. Inside the limits of Toquepala orebody in Peru, quartz-tourmaline brecciafragmentsb |
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