Magmatic Evolution of the Giant El Teniente Cu–Mo Deposit, Central Chile

Stern, Charles R.; Skewes, M. Alexandra; Arévalo, Alejandra

doi:10.1093/petrology/egq029

Cited by 70 publications

(105 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The textures of these rocks are for this reason notably different from typical phorphyritic, plagioclase-rich olivine basalts (Fig. 3d) of the older Late Miocene El Teniente Volcanic and El Teniente Mafic Complexes, in which plagioclase phenocrysts are in most cases larger than either the olivine or clinopyroxene phenocrysts and make up the dominant volume of the rock (Skewes et al, 2002Stern et al, 2010), and hornblende is absent. We therefore suggest that the olivine+hornblende-bearing dikes are better classified as olivine+hornblende lamprophyres rather than olivine basalts, as elaborated further in the discussion.…”

Section: Sample Petrochemistrymentioning

confidence: 83%

“…2 (Stern et al, 2010), and other hornblende andesite sills, located less than 1 km to the north at Cerro Montura near the head of the Quebrada los Sapos, have been dated as 8.2±0.5 and 6.6±0.4 Ma (Cuadra, 1986). The dikes in the Quebrada los Sapos contain abundant phenocyrsts of mafic minerals, including Mg-rich olivine (Fo88; Tables 1 and 2) up to 3x4.0 mm in size (Fig.…”

Section: Sample Petrochemistrymentioning

confidence: 99%

“…3a and 3b), but otherwise the original mineralogy and textures of these rocks has not been affected by alteration. Cognate gabbroic crystal agglomerates consisting of the phenocryst phases brown hornblende > clino- This figure is essentially a geologic map, with only two units; upper Miocene lavas and pyroclastic f l ows of El Teniente Volcanic Complex (6.5 to 14 Ma; Kay et al, 2005) intruded by sills of El Teniente Mafic Complex, one of which has been dated as 8.9±1.4 Ma (Stern et al, 2010), and the mafic olivine + hornblende lamprophyre dikes which cut these units and are therefore younger than this latter age. For a larger geologic map of this area see figure 3 in Cuadra (1986).…”

Section: Sample Petrochemistrymentioning

confidence: 99%

“…1), the world's largest Cu-Mo deposit (Skewes et al, 2002, provide a relatively detailed chronologic (Charrier and Munizaga, 1979;Cuadra, 1986;Kurtz et al, 1997;Maksaev et al, 2004;Kay et al, 2005) and petrochemical (Stern and Skewes, 1995;Nystrom et al, 2003;Kay et al, 2005;Muñoz et al, 2006;Stern et al, 2010) data base for understanding the temporal evolution of Andean magmas in this section of the Andes of central Chile. In fact, this is one of the best studied regions of the Andes with respect to the evolution of late Cenozoic igneous rocks, due in part to the interest in understanding the relation of igneous activity to the genesis of the giant El Teniente deposit.…”

Section: Introductionmentioning

confidence: 99%

“…Kay et al (2005) and Muñoz et al (2006). components are incorporated in Andean magmas by either intracrustal contamination (MASH; Hildreth and Moorbath, 1988), source region contamination (Stern, 1991(Stern, , 2004Stern and Skewes, 1995), or a combination of both (Kay et al, 2005). The lamprophyres also have interesting implications for understanding the evolution of magmas associated with the generation of the giant El Teniente Cu-Mo deposit (Stern et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Diques lamprofidicos de olivino-hornblenda de la quebrada los Sapos, El Teniente, Chile central (34°S): implicancias para la evolucion temporal de la geoquimica del manto subarco Andino.

Stern¹,

Floody²,

Espiñeíra³

2011

Andgeo

Self Cite

View full text Add to dashboard Cite

AbSTRACT. Mafic Mg-olivine (Fo88)+hornblende lamprophyre dikes, with Ni ~190 ppm and Cr ~390 ppm, cut late Miocene lavas in the Quebrada los Sapos a few kilometers west of the El Teniente Cu-Mo mine. These dikes have petrochemical affinities with other less primitive, Pliocene (2.9-3.9 Ma), olivine-free lamprophyres previously described from both within and in the vicinity of El Teniente. The mafic mantle-derived lamprophyre dikes from Quebrada los Sapos have La/Yb ratios of 10-13, higher than the ratios of 4-9 for older Late Miocene El Teniente Mafic Complex olivine basalts, suggesting a temporal decrease in the percent of partial mantle melting, consistent with the observed decrease in the volume of igneous rocks through time at this latitude, as well as the ultimate cessation of magmatism and >40 km eastward arc migration by the Late Pliocene. Less primitive olivine-free lamprophyres have higher La and lower Yb, resulting in higher La/Yb ratios of 15-44, due to crystal-liquid fractionation involving hornblende, but not plagioclase, the crystallization of which is suppressed by the high H 2 O contents of the lamprophyres. The lamprophyre dikes, as well as younger ( 1. Pb, and lower Є Nd for mantle-derived mafic magmas, and by implication their mantle source region. Significantly Sr, Nd and Pb isotopic compositions are independent of SiO 2 content for rocks in each age group, which precludes contamination by isotopically heterogeneous Paleozoic and Mesozoic continental crust during evolution of intermediate and silicic rocks from mantle-derived mafic magmas. The Oligocene to Pliocene isotopic evolution of the mantle source of the mafic magmas may be explained by an increase from 1% to 6% in the extent of mantle source region contamination by subducted components, including continental crust tectonically eroded off the continental margin. We attribute this to both decreasing subduction angle and increasing rates of subduction erosion associated with the southward migration of the locus of subduction of the Juan Fernández Ridge. The lamprophyres also imply increased hydration of the mantle below this portion of the arc by the Pliocene, which may have played an important role in producing oxidized volatile-rich magmas and mineralization at El Teniente. sapOs, el TenienTe, CenTral Chile (34°s)... RESumEn. Diques lamprofídicos de olivino-hornblenda de la quebrada los Sapos, El Teniente, Chile central (34°S): implicancias para la evolución temporal de la geoquímica del manto subarco Andino. Diques de lampró-fidos máficos, con fenocristales de olivino magnésicos (Fo88)+hornblendas y contenidos de Ni ~190 ppm y Cr 390 ppm, cortan lavas miocénicas superior en la quebrada los Sapos a escasos kilómetros al oeste del depósito de Cu-Mo El Teniente. Estos diques tienen afinidades petroquímicas con otros diques lamprofídicos del Plioceno (2,9-3,9Ma), menos primitivos y sin fenocristales de olivinos, los cuales han sido descritos tanto dentro como alrededor de El Teniente. Estos diques de lamprófidos máficos en la quebrada lo...

show abstract

Section: Sample Petrochemistrymentioning

confidence: 83%

Section: Sample Petrochemistrymentioning

confidence: 99%

Section: Sample Petrochemistrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Diques lamprofidicos de olivino-hornblenda de la quebrada los Sapos, El Teniente, Chile central (34°S): implicancias para la evolucion temporal de la geoquimica del manto subarco Andino.

Stern¹,

Floody²,

Espiñeíra³

2011

Andgeo

Self Cite

View full text Add to dashboard Cite

show abstract

Mineralization of the Xuejiping porphyry Cu deposit, Western Yunnan, China: Constraints from magmatic oxidization and source

Yang

Fang

et al. 2020

Geological Journal

View full text Add to dashboard Cite

Xuejiping porphyry Cu deposit is located in the south of Yidun island arc, northwest Yunnan. Tectonically, it lies in the middle part of the “Sanjiang Rivers” metallogenic belts. There are ore‐barren quartz diorite, quartz diorite porphyrite (QDP), and ore‐bearing quartz monzonite porphyry (QMP) intruded into clastic‐volcanic rocks of the late Triassic Tumugou Formation. This study focused on determining why the ore‐bearing porphyry is the QMP. It analyzed the correlation between chronology, geochemistry, magmatic oxygen fugacity, and mineralization. Results show that the crystallization age of QDP is 228.7 Ma and that of QMP is 215.0 Ma, which is relatively younger. The molybdenite Re‐Os age is 219.9 Ma. The oxygen fugacity of QDP and QMP magma are higher than Fayalite‐Magnetite‐Quartz buffer, but the oxygen fugacity value of QDP magma is relatively dispersed, with high and low values. While the QMP falls in the high oxygen fugacity range. The δ18O value of QDP (from 5.66 to 6.27 with an average of 6.02) is higher than that of QMP (from 5.53 to 6.42 with average 5.76). It indicates that the QMP contains more components from the mantle than QDP. It is suggested in this paper that QMP have more potential of ore‐formation in the later stage. The QDP caused ore‐forming elements pre‐enrichment in the region. Millions of years later, the QMP intruded in QDP, the pre‐enriched elements were activated and superimposed with the ore‐forming elements of QMP, then the ore‐forming elements were carried and integrated into the ore deposit, and enriched once again.

show abstract

Origin of the Tudigou intrusion and associated porphyry Cu mineralization in the southern Qinling, Central China: Implication for regional tectonic setting

et al. 2022

View full text Add to dashboard Cite

The Tudigou porphyry Cu deposit is located in the central part of the southern Qinling belt. Copper mineralization is closely associated with monzogranite porphyry.Zircon LA-ICP-MS U-Pb dating of monzogranite porphyry suggests that the ages of magmatism at Tudigou vary between 150 ± 1 and 148 ± 1 Ma and overlap with the molybdenite Re-Os age of 150-148 Ma, indicating that the Tudigou intrusion and associated mineralization formed during the Late Jurassic. The enrichment in largeion lithophile elements, depletion in high-field-strength elements, high Ba/Th and La/ Yb ratios, and negative correlation between Dy/Yb and La/Sm ratios, together with narrow ranges of ε Hf (t) values (ε Hf (t) = À4.0 to +1.4) suggest monzogranite porphyry was derived from a metasomatized lithospheric mantle with minor crustal components contribution, which is also evidenced by the lead isotopic result. The La/Yb ratios of 30 Mesozoic plutons in the southern Qinling belt were used to calculate the Moho depth, which suggests that the magmatism and mineralization in the region occurred during lithosphere thinning in response to the tectonic transition from compression to extension transitional regime. The calculated oxygen fugacity of the Late Mesozoic porphyry deposits in the Qinling-Dabie orogen have identical ΔFMQ values (averaging +1.4 to +2.4). However, the V/Sc ratios (the proxy for water content) are distinct among different deposit sizes, indicating that the dissolved water in the magma plays a critical role in porphyry-type mineralization.

show abstract

Magmatic Evolution of the Giant El Teniente Cu–Mo Deposit, Central Chile

Cited by 70 publications

References 66 publications

Diques lamprofidicos de olivino-hornblenda de la quebrada los Sapos, El Teniente, Chile central (34°S): implicancias para la evolucion temporal de la geoquimica del manto subarco Andino.

Diques lamprofidicos de olivino-hornblenda de la quebrada los Sapos, El Teniente, Chile central (34°S): implicancias para la evolucion temporal de la geoquimica del manto subarco Andino.

Mineralization of the Xuejiping porphyry Cu deposit, Western Yunnan, China: Constraints from magmatic oxidization and source

Origin of the Tudigou intrusion and associated porphyry Cu mineralization in the southern Qinling, Central China: Implication for regional tectonic setting

Contact Info

Product

Resources

About