Download Andesinophyrite, andesine-bearing plagioclase porphyrite

ROCKS
Andesinophyrite, andesine-bearing plagioclase porphyrite
(andezinofirittufa [andesinophyrite tuff]), Szentpétery,
Zs. (1935: 271)
Name created for a mainly andesine-bearing plagioclase
porphyrite.
Loc.: Fehér[-]kő Hill at Lillafüred [then ∩ Hámor, now
∩ Miskolc], Hungary. See Szentpétery (1935: 255) for a
map.
Name: Contracted form of andesine porphyrite (cf. →oligophyrite and →plagiophyrite).
aschgrauer körniger Zeolith = →perlite (1) syn.
banatite, collective name for an Upper Cretaceous, mainly
granodioritic rock series
(Banatit), Cotta, B. von (1864: 13)
Cotta (1864: 13–18) gave the collective name of banatite
to the Cretaceous magmatic series found in the Banat
region, Hungary* [now Romania] and in the northern
part of Serbia. These rocks had variable mineralogy and
were often associated with ore bodies.1 According to
Cotta banatites differed from granites by the absence, or
a low content, of quartz and by the predominance of plagioclase. They were also different from syenites by the
predominance of plagioclase and the abundance of
biotite over amphibole. Banatites differed texturally from
both rocks by the fine-grained to compact groundmass.
Major constituents of banatites were colourless diopside,
brown and green amphibole, biotite, rarely hypersthene,
idiomorphic, zoned andesine, xenomorphic orthoclase
and some quartz. József Szabó considered these rocks
Tertiary in age and partly for this reason he proposed the
name of andesine quartz trachyte (see Rozlozsnik &
Emszt, 1908: 146).
Brögger (1895: 61) defined banatites chemically as
intermediate quartz monzonites (63–66% SiO2) between
monzonites and adamellites.2 Kolderup (1897: 14–17,
120–130) gave this name to adamellites with abundant
plagioclase. Osann (1903) made two groups for quartzbearing diorites and classified banatites into the more
mafic group, while Rosenbusch (1907: 293) placed them
among quartz diorites.
Based on detailed comparative studies Rozlozsnik & Emszt
(1908a,b) showed that banatites were both chemically
and petrographically close to the rocks termed granodiorites from the 1890s. Rozlozsnik & Emszt (1908a:
1 “... ich verstehe unter Banatit kein Gestein von bestimmter Zusammensetzung oder Textur, sondern den Inbegriff aller Eruptivmassen, welche im Banat und den angrenzenden Ländern jedenfalls
erst nach Ablagerung des Juraformation, wahrscheinlich sogar erst
nach Ablagerung des Kreidebildungen, aber vor die Basalten, und
gegenseitig ungefähr gleichzeitig, empor eingedrungen sind” (Cotta,
1864: 13).
2 Based on a sample brought by Cotta from “Szaszka” [Sasca Montană,
ROM] and analysed by Scherer.
178, 1908b: 189) argued that in spite of the priority of
banatite it should be better to drop the name because of
its former ambiguous usage. In his equivalently detailed
paper, however, Codarcea (1932: 339–342, 416) suggested
to keep the term of Cotta in its original sense as a collective name in spite of the really variable composition
of these rocks. According to Johannsen (1932: 349) “the
term is obsolescent and, being so loosely defined, should
be entirely abandoned.”
According to the recommendation of the IUGS (Le Maitre,
1989: 49) banatite is not a rock name. It is “a term for a
series of a rocks ranging from granite to diorite (but
mainly granodiorite) that were intruded in Upper Cretaceous time in the Banat and adjacent areas of Hungary
and Yugoslavia”. See Russo-Săndulescu in Ilinca et al.
(1993: 8) for further data on banatite and Marincea
(2000: 810) for a map of the “Banatitic petrographic
province” within the Carpatho-Balkan area.
It is to be noted that recently a new term, the Banatitic
Magmatic and Metallogenetic Belt (BMMB) was introduced by Berza et al. (1998) for the Upper Cretaceous,
ore-bearing igneous belt, which runs discontinuously
from the Apuseni Mountains in the north, to the western
part of the South Carpathians (Banat) in Romania, and
further south to the Carpathians of East Serbia and still
further east to Srednogorie (Bulgaria).
Loc.: The Banat region and northern part of Serbia (as of
1864). Localities with ore deposits mentioned by Cotta
(1864: 16) were “Rézbánya” = Băiţa (Bihor), Milova,
“Petirs” = Pătârş, “Moravicza” = Ocna de Fier, “Dognácska” = Dognecea, “Oravicza” = Oraviţa Montană,
“Csiklova” = Ciclova Montană, “Szaszka” = Sasca Montană, “Neu Moldova” = Moldova Nouă [all in Romania],
“Kuczaina” = Kučajna, and Rudnik, both in Serbia.
Name: For the German name of the region.
bornite, collective name for different altered ore-bearing
rocks, mainly propylite3
Pinkerton, J. (1811: 2: 239)
Born called the ore-bearing rocks of the Hungarian*
and Transylvanian ore mountains saxum metalliferum
borrowing this term from Linné (e.g. Linné, 1770: 78).
According to Born the hard groundmass of the rock is
hardened clay [in fact it is a microcrystalline matrix].
Minerals seen with the unaided eye were described
somewhat differently in his different works such as
quartz, lithomarga [kaolinite?], basaltes [here: amphibole], spatum scintillans [feldspar] in Index Fossilium (Born, 1772:154),4 and instead of feldspar he
mentioned calcite5 in his Briefe (Born, 1774: 206–207).
Several minerals were marked by the name of bornite; see page 9.
“Saxum metalliferum dico; Concretum ex Argilla communi indurata
& particulis quarzosis, quibus interdum Lithomarga, Basaltes, vel
Spatum scintillans immiscetur. Montes metalliferos Hungariae et
Transilvaniae potissimum ex hoc consistunt” (Born, 1772: 154).
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