Iron Chloride (Fe[Cl.sub.3]) Chloride corrosion products Iron Chloride Hydrate (Fe[Cl.sub.2]-4[H.sub.2]0) Calcite (CaC[O.sub.3]) Carbonate scale Aragonite (CaC[O.sub.3]) Siderite (FeC[O.sub.3])
Basanite (CaS[O.sub.4].
El-Anbaawy, "Chemical changes and authigenic mineral formation during palagonitization of a
basanite hyaloclastite, Gran Canaria, Canary Islands," Neues Jahrbuch fur Mineralogie-Abhandlungen, vol.
Two main lineages are apparent for the potassic rock-types (Figure 5 and inset (II)): (1) a silica undersatured lineage (B-P) ranging from
basanite to phonolite and peralkaline phonolite and (2) a silica-saturated lineage (AB-T) ranging from alkali basalt to trachyphonolite and trachyte [13,42,44].
Lavas recovered from Bowie seamount range from alkalic basalt and
basanite through hawaiite, mugearite and benmoreite (Engel et al.
During this period volcanic activities continued locally, represented by analcite bearing
basanite and andesites.
In the Montreal area such rocks are mostly alkaline syenite, monzonite,
basanite or alkali olivine basalt, and lamprophyre, especially camptonite (Hodgson, 1968; Eby, 1985).
This glass is compositionally similar to groundmass glass in the host
basanite. 2) Silica-undersaturated alkaline glass associated with amphibole in peridotites.
Thermoclasty does not appear to explain spheroidal weathering in concentric layers (exfoliation or onionskin weathering), common in rocks such as
basanite. These instead seem to be due to the action of water.
Lava flows from San Martin Tuxtla are classified as
basanite and alkali basalt.
Figure 2 reveals that most analyzed samples lie in the fields of basalt and
basanite, except a few samples fall in foidite and picrobasalt field (Figure 2(a)).
The volcanic rocks comprise of pillowed (Fig.3b) and massive
basanite, alkali-basalt, and trachy-basalt and also occur as hyaloclastite and reworked volcanic breccias (Fig.
Three reference suites from Iceland, Moorea and Tristan da Cunha illustrate (respectively) the tholeiitic series containing basalt to rhyolite, the alkaline series with alkali basalts to trachytes and a strongly alkaline series, beginning with
basanite and ultimately yielding phonolite; few oceanic islands contain tholeiiteseries rocks.