Experimental Studies on K-Rich Rocks - Origin of Potassium-rich Silica-deficient Igneous Rocks - page 375

Table 13.1 One Atmosphere Melting Studies on Potassic Rocks From Leucite Hills, Wyoming, U.S.A
Sr.
No.

Liquidus ( o C) Crystalline (assemblage shown in

bracket)

Locality Liquidus

Phase

Solidus
( o C)

Source

1. Orendite (Lc + Sa + Cpx + Ap + Cal) South Table

Mountains

Cpx 1,302 Yagi and Matsumoto

(1966)

2. Wyomingite

(Lc + Cpx + Ph + Ap + Cal + Mt)

Boars tusk Cpx 1,322 Yagi and Matsumoto

(1966)

3. Xenolith (included within Wyomingite) Boars tusk Cpx 1,318 Yagi and Matsumoto

(1966)

4. a

Wyomingite (mineralogy same as No. 2) Boars tusk (Ph + Cpx) 1,270

(1,250

1,000 Sobolev et al. (1975)

1,150)

-

5. Wyomingite (mineralogy same as No.2) Boars tusk Lc 1,200 1,000 Fyfe (quoted in Carmi-

chael 1967)

6. Olivine orendite (Ol + Lc + Sa

+Cpx + Ap + Cal)

South Table
mountain

Ol 1,275 1,000 Fyfe (quoted in Carmi-

chael 1967)

7. Olivine orendite (mineralogy same as Sl.

No. 6)

North Table
Mountain

(Lc + Ol) 1,215 1,000 Fyfe (quoted in Carmi-

chael 1967)

8. Madupite (Ph + Cpx + Mt) Pilot Butte Lc 1,245 1,040 Fyfe (quoted in Carmi-

chael 1967)

a Fluid inclusion study
Lc leucite, Sa sanidine, Cpx clinopyroxene, Ap apatite, Cal calcite, Ph phlogopite, Ol olivine, Opx orthopyroxene, Mgt magnetite, Ilm ilmenite