Browse Items (23 total)

  • Collection: (NAO) Ophiolite Suite -- Northern Apennines, Italy

Western Minerals NAO OCR-1.pdf
OCR PDF of supplemental information for the Northern Apennines Ophiolites collection.

http://dl.dropbox.com/u/66399955/NAO-1.JPG
Partially serpentinized Olivine Gabbro.

http://dl.dropbox.com/u/66399955/NAO-2.JPG
Spilitized pillow basalt with overprinted prehnite-pumpellyite facies metamorphism. Arborescent ophitic to spherulitic texture; ablitized and saussuritized plagioclase, chloritized glass matrix, with occasional epidote.

http://dl.dropbox.com/u/66399955/NAO-3.JPG
Partially serpentinized tectonic lherzolite. Occasionally newly formed diopside may be noted.

http://dl.dropbox.com/u/66399955/NAO-4.JPG
Traces of oceanic metamorphism in greenschist-amphibolitic facies and weak overprint in prehnite-pumpellyite facies.
Metamorphic oceanic paragenesis: dark hornblende, actinolite, chlorite, oligoclase-albite in microfractures or reaction rims on…

http://dl.dropbox.com/u/66399955/NAO-5.JPG
Dioritic gabbro with deformational oceanic metamorphism of amphibolitic to greenschist facies and overprinting of prehnite-pumpellite.
Primary phases: plagioclase, clinopyroxene, olivine, ilmenite. Oceanic metamorphic paragenesis: plagioclase,…

http://dl.dropbox.com/u/66399955/NAO-6.JPG
Tectonic-sedimentary breccia of serpentinite modified by hydrothermal events in oceanic environment.

http://dl.dropbox.com/u/66399955/NAO-7.JPG
Rhodingitized gabbro dike in serpentinite. Chlorite, hydrogrossularia, diopside, prehnite, pumpellyite, vesuviane.

http://dl.dropbox.com/u/66399955/NAO-8.JPG
Basalt dike in gabbro with prehnite-pumpellyite overprint.

http://dl.dropbox.com/u/66399955/NAO-9.JPG
Peridotite, serpentinized, with plagioclase with harrisitic structure.

http://dl.dropbox.com/u/66399955/NAO-10.JPG
Serpentinized peridotite with plagioclase, olivine, plagioclase, clino-pyroxene, chromite. Secondary minerals include hydrogrossuaria as well as serpentine, chlorite, prehnite.

http://dl.dropbox.com/u/66399955/NAO-11.JPG
Hyaloclastite of basalt with superimposed metamorphism in pumpellyite-prehnite facies.

http://dl.dropbox.com/u/66399955/NAO-12.JPG
Serpentine (lizardite) with some structural deformation present.

http://dl.dropbox.com/u/66399955/NAO-13.JPG
Doleritic basalt with metamorphic overimprinting in prehnite-pumpellyite facies.
Primary minerals: plagioclase, titanaugite, ilmenite, olivine.
Metamorphic paragenesis: albite, pumpellyite, prehnite, sphene, chlorite.

http://dl.dropbox.com/u/66399955/NAO-14.JPG
Na-clinopyroxene (chloromelanite), almandine garnet, rutile, glaucophanic amphibole, harrisitic hornblende, epidote, ablite, chlorIte. Chloromelanite pseudomorphs on primary pyroxenes and chloromelanitic aggregates in plagioclase; granoblastic…

http://dl.dropbox.com/u/66399955/NAO-15.JPG
Gabbro with hydrothermal "oceanic" processes and prehnite-pumpellyite metamorphic overprint.
Plagioclase, clinopyroxene, olivine, ilmenite. metamorphic paragenesis: albite, sericite, chlorite, hematite, sphene, carbonates. Well-preserved relics of…

http://dl.dropbox.com/u/66399955/NAO-16.JPG
Antigorite, magnetite, carbonates (ankerite), diopside, clinohumite, tremolite, chlorite. Rarely, pseudomorphs on primary pyroxenes may be recognized, though there is superimposition of various deformational phases.

http://dl.dropbox.com/u/66399955/NAO-17.JPG
Antigorite, magnetite, ankeritic carbonate, diopside, tremolite. A very marked subsequent foliation nearly completely obliterates a previous initial foliation.

http://dl.dropbox.com/u/66399955/NAO-18.JPG
Grossular-andradite garnet, diopside, chlorite, sodic pyroxene, vesuvianite, titansphene, opaques. Traces of primitive gabbroid structure with diablastic development of the newlyformed phases and pseudomorphs of sodic pyroxene on primary pyroxenes.…

http://dl.dropbox.com/u/66399955/NAO-19.JPG
Relics of augitic clinopyroxene, albite, actinolite, chlorite, clinozoisite, and sphene. Relics of the clinopyroxene of the original dolerite are in part substituted by chlorite and actinolite in a granoblastic and metablastic matrix of albite,…
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