...F. C. Monastero; A. E. Sabin; J. D. Walker Abstract The Cudahy Camp Formation, located in the El Paso basin, east-central California, consists of a 350-m-thick volcanic and sedimentary sequence of early Miocene age. Previous investigators determined from paleocurrent indicators that the source...

... the predominantly volcanic Cudahy Camp Formation (ca. 18–15 Ma; Loomis and Burbank, 1988 ; Whistler et al., 2009 ). The study interval mostly consists of sandstones and mudstones interbedded with at least 18 laterally extensive ash units ( Loomis and Burbank, 1988 ; Whistler and Burbank, 1992 ; Perkins et al...

..., and stratigraphic relations ( Sabin, 1994 ). Monastero et al. (1997) correlated the Eagle Crag Volcanics to the Cudahy Camp Formation ( Cox and Diggles, 1986 ) in the El Paso Mountains. Middle Miocene basalt. Vesicular basalt overlies the lower Miocene units in the LMSR. These are finely porphyritic...

... alteration halo of a deposit, whereas unaltered host rocks contain Al-rich white mica ( Cudahy, 1997 ; Bierwirth et al., 2002 ; Duuring et al., 2016 ). In any case, change in white mica Al composition, tracked through Al-OH feature wavelength shift in relationship to host rock white mica Al content, can...

...Wei Tan; Xiaorong Qin; Jiacheng Liu; Mei-Fu Zhou; Hongping He; Christina Yan Wang; Jian Huang; Jianxi Zhu; Yuzeng Yao; Thomas Cudahy Abstract Regolith-hosted rare earth element (REE) deposits predominate global resources of heavy REEs. Regoliths are underlain by various types of igneous rocks...

...Rui Wang; Tom Cudahy; Carsten Laukamp; John L. Walshe; Adam Bath; Yuan Mei; Carl Young; Tony J. Roache; Andrew Jenkins; Malcolm Roberts; Andrew Barker; Jamie Laird Abstract Patterns in white mica (muscovite, paragonite, and phengite) Al-Si chemistry (Tschermak substitution) were examined...

... . Monastero , F.C. , Sabin , A.E. , and Walker , J.D. , 1997 , Evidence for post-early Miocene initiation of movement on the Garlock fault from offset of the Cudahy Camp Formation, east-central California : Geology , v. 25 , p. 247 – 250 , https://doi.org/10.1130/0091-7613(1997)025<0247...

...Saeid Asadzadeh; Sabine Chabrillat; Thomas Cudahy; Bahman Rashidi; Carlos Roberto de Souza Filho Abstract Porphyry copper deposits are associated with large alteration footprints, and alteration mapping plays a key role in the exploration of these deposits. Imaging spectroscopy is commonly deployed...

.... At the older times, ca. 11 Ma ( Fig. 9A ), the Garlock fault was not a barrier to deposition, and depositional systems crossed the zone of the future structure unimpeded. This is well shown in Monastero et al. (1997) , who interpreted rocks in the Dove Spring Formation and underlying Cudahy Camp Formation...

... . Monastero , F.C. , Sabin , A.E. , and Walker , J.D. , 1997 , Evidence for postearly Miocene initiation of movement on the Garlock fault from offset of the Cudahy Camp Formation, east-central California : Geology , v. 25 p. 247 - 250 . Pavlis , T. , Serpa , L.F. , Troxel , T.W...

... initiation of movement on the Garlock fault from offset of the Cudahy Camp Formation, east-central California : Geology , v. 25 , p. 247 – 250 , doi:10.1130/0091-7613(1997)025<0247:EFPEMI>2.3.CO;2. Müller , W. , Prosser , G. , Mancktelow , N. , Villa , I. , Kelley , S...

..., Matagami camp, Abitibi greenstone belt, Canada: Petrogenesis and implications for VMS formation and exploration : Mineralium Deposita , v. 49 , p. 489 – 512 . Gifkins , C. , Herrmann , W. , and Large , R. , 2005 , Altered volcanic rocks; a guide to description and interpretation...

... Miocene initiation of movement on the Garlock fault from offset of the Cudahy Camp Formation, east-central California : Geology , v. 25 , no. 3 , p. 247 – 250 , doi:10.1130/0091-7613(1997)025<0247:EFPEMI>2.3.CO;2 . Monastero F.C. Walker J.D. Katzenstein A.M. Sabin A.E...

.... 28 p. 91 . Monastero , F.C. , Sabin , A.E. , and Walker , J.D. , 1997 , Evidence for post–early Miocene initiation of movement on the Garlock Fault from offset of the Cudahy Camp Formation, east-central California: Geology , v. 25 p. 247 – 250 . Monastero , F.C...

... of techniques used in this study represents a new approach outside VMS mining camps and could be applied elsewhere. Previous published investigations of sulfide-bearing stratified intervals, iron formations, etc., were done in established mining camps, with a known stratigraphy and structure, and the VMS...

... interpretation. Regardless, the phengitic compositions of the micas associated with porphyry formation are on the whole sufficiently compositionally different to produce the longer-wavelength 2,200-nm absorption features that are distinct from those found in plutonic and volcanic arc rocks not affected...

...Paul Duuring; Lee Hassan; Mario Zelic; Klaus Gessner Abstract Volcanic-hosted massive sulfide (VMS) occurrences in the Quinns district are hosted predominantly by ca. 2814–2800 Ma banded iron formation (BIF) within a sequence of rhyolite, basalt, and minor siltstone. The VMS occurrences...

... are common in eastern Yilgarn gold camps. * E-mail: [email protected] Manuscript handled by Celestine Mercer 21 11 2017 20 8 2018 Copyright © 2018 by the Mineralogical Society of America 2018 Mineralogical Society of America The Sunrise Dam deposit is located...

... with increasing formation temperature ( Cudahy et al., 2008 ; Doublier et al., 2010 ). Spectral identification of minerals was made using Halo and The Spectral Geologist (TSG™) software (Spectral Geoscience Pty. Ltd.); both have inbuilt automated mineral identification matching algorithms. The suggested...

... compositions (e.g., muscovite, paragonite, phengite, celadonite, Fe chlorite, and Mg chlorite) within a VMS system due to different physicochemical conditions in different parts of the system. High temperatures are favorable for the formation of Al-rich muscovite and Fe-rich chlorite and biotite ( Miyashiro...