Coarse-granular kinds. 
Summary tabulation of the eruptive rocks of the Keieenay Series, showing their m 
nam Series, showin 
Fine-granular kinds, 
utual transitions and relations. 
——_ a 
Porphyritic kinds, 7. ¢., kinds containing some 
Half glassy vesicu- 
BASIC KINDS. 
Silica 45 to 52 per cent. 
Silica 45 to 48 per cent. 
‘ 
Olivine-gabbro (B 1). 
Olivine. 
aa 
jallage. 
Titaniferous magnetite. 
Non-orthoclastic, olivine-free (' 
(in part only) (Bl). 
Anorthite or labradorite. 
Diallage or re 
Titaniferous magnetite, 
Anorthite rock; a special phase (B 4). 
abbro and diabase 
Grading Ss f 
grain and loss of diallagic cleavage 
in the angite, which remains coarser 
than the other constituents, into 
_ 
Grading by increasing fineness of 
grain into —> 
by increasing fineness of 
Olivinitic diabase and melaph 
tled”” rocks), 
Anorthite. 
Olivine. 
Augite. 
UF (“lustermot- 
B6 (in large part), 
Titaniterous magnetite, 
Pseud-amygdaloids a specini phaso, 
Grading, by addition of residuary magma, into 
—_—_> 
Labradorite. 
Augite. 
Magnetite. 
“ Ordinary -type” di A 
(B5) Ip wabase (in smi 
Pseud-amygdaloids a special phase, 
all part. on] y) 
Grading by decrease in amount of augite and 
change of the augite into aggregates of 
Romie ains, into 
“Ashbed ”-diabase (B 7) (in small part only) and 
this, by introduction of unindividualized ma- 
terial and increasing fineness of grain, into 
—pP 
ding by loss of olivine, decrease in basicity 
ort the plagioclases, and, in some kinds, by 
addition of orthoclase, into 
| 
Grading by loss of olivine and 
sicity of plagioclase, into 
| 
decreasing bya. 
Silica 48 to 52 per cent. 
INTERMEDIATE 
KINDS. 
— 
Non-orthoclastc olivine-free gabbro and diabase 
(in part only) (B 1). 
Labradorite. | 
Diallage or augite. — 
Titaniferous magnetite. 
Orthoclase-gabbro (in small part only) (B 2). 
Labradorite or oligoclase. 
Orthoclase. 
Diallage and angite. 
Titaniferous magnetite. 
fc iw Leone common accessories. 
ralitic gabbro )e * 
Hornblende-gabbro (B 3). } special phases. 
Grading by increasing fineness of 
grain into —> 
Labradorite or oligoclase, 
Augite. 
Titaniferous 1 
magnetite. 
Pseud-amygdaloids a special phase, 
“ Ordinary-type”’ diabase (tho larger part) (B 5). Grading, as above, into 
“Ashbed"’-diabase (in part) (B 7), and this as 
above, into-——> 
Grading by decreasing basicity of plagioclase, 
increase of orthoclase, and introduction of 
secondary quartz, into 
| 
Grading by decreasing basicity of feldspars 
into 
| 
— 
Silica 52 to 60 per cent. 
Orthoclase-gabbro (the larger part) (B 2). 
Oligoclase. 
Orthoclase. 
Diallage. 
Augite. 
Titaniferous magnetite. 
Apatite, uralite and secondary quartz, very 
common accessories. : 
Uralitic orthoclase-gabbro (B 2). 
Hornblende-gabbro (B 3). } special phases. 
Gradation forms not known, into —> 
“Ordinary-type” diabase (in small part 0 
Oligoclase. 
Orthoclase possi 
per cent. 
when silicified by 
Pseud-amygdaloids & spe 
t. 
ACID KINDS. 
Silica 60 to 78 per cen 
Grading by decrease of augitic consti 
U ig stituent, 
increase of orthoclase and of quartz, ng api 
| 
Gradation phe 
Augite-syenite (in 
Olinpolase. RAPHE) 
Orthoclase. 
Augite (very subordinate), 
Verrite and ‘aby - 
accessories, indant quartz characteristic 
Silica 60 to 70 per cent. 
{24 25 Le ae 
Grading by decre r 3 
Grease or quate oe oligoclase and great in- 
| 
a 
Grading by increasing fineness of 
grain, into —> 
Fine- 
Orthoclase. 
Oligoclase. 
Augite. 
Ferrite. 
Secondary ¢ 
eS 
Grading by in 
Augite-granite (A 4) 
rer elt rag and 
Orth tise. (in part). 
igoc! 
Quint Se (not always present). 
ugite 
y ig M4 (always. more or less thoroughly al- 
to fi . 
Hats errite or hornblende and very 
granitell or granitic 
Silica 70 to 78 per cent. 
Grading by i i fi 
acing by increasing fineness of 
grain, into —> = 
‘ 
Lace page 126 V 
Page 126, Vol, V, Irving. 
So —- 
Fine-grained g/ 
(in part). 
Oligoclase. 
Quartz. 
Augite (Vv 
chlorite, 
Ferrite. 
Secondary 
quartz. 
creasing amount 
| 
-anitell or 9! 
Orthoclase. 
0, 
ery sparse, 
or uralite) 
quartz. 
bly in a few kinds(!). 
ls) (B 5}. 
Grading through increasi 
in, rai 
loss of crystalline ontlinas CSE aateiar 
introduction of irresolvable base, into—_» 
ases not know}, into 
grained augite-syenite (A 9). 
of ui 
alter! 
into 
ao 
raniticp?” 
F pyrite, 
to the augite, and | 
| Tabular plagioclases. 
| Round augite particles. 
| Magnetite. 
Trresolvable base, often in very large pro 
portion. 
Much ferritie material in the base. 
Porphyritic plagioclases and augites. 
Grading by still further increase in acidity, in 
troduction of orthoclase among the feldspars, 
and loss of augite in the base, into 
Y 
Grading by introduction of fe 
‘creasing fineness of stain, into—> 
Isitic matter, and | 
Quartzless porphyries (A 1). 
Groundmass: 
Micro-felsitic matter. 
Crypto-crystalline matter. 
Ferrite. 
Tabular feldspars. 
Secondary quartz. 
Porphyritic ingredients: 
Oligaclase and orthoclase. 
Anugite with ferritic decay. 
dity, loss of tabular 
, and introduction of 
Grading, by increasing 
feldspars in the 
porphyritice quartz, into 
| 
incrensi ao 
Grading by 
100 of fe), 
introdue’ ng fineness of grain, and 
sitic matter, into— + 
Quartziferous porphyry and felsite. 
little). 
ystalline matter. 
felsitic matter. F 
-ystalline matter (subordinate). 
Ferrite. | 
Glass (ver. 
Cry 
Secondary quartz. 
Porphyritic ingredients: 4 
Quartz (corroded dihexahedral pyramids). 
Orthoclase and oligoclase. 
Augite (rare). 
unindividualized matter. 
lar kinds, 
Melaphyrs or ‘‘luster-mottled” rocks of P i =a oa 
: . ! um- | Grad ‘out = 
elly. Haveattimesalittle residuary magma, pes ea Ss S = 
a uit it never antonute to much. of mucryatalline ea: 
uine i Phi ici Sel ves 
on eX hyritic kinds of high basicity are base, and intro- & 3 
nkn duction of gas . a 
vesicles, into —> £ 2 
22 3 
aa | 
Diab oe a 
‘abase-porphyrife (in small part only) (B 7). { ‘ sag a ¢ 
Tabular plagioclases, sa a er fee = 3 
Beane augite particles. of uncrystalline s hae 
Fae aed base, and intro- a7 ks 
Is esolvable base. duction of gas S.n$ Uex 
orphyritic plagioclases and rarer angites. vesicles, into—> es 2 a Bo 
an - 
~ ess S23 
SSb SBE 
: : ; aio ES 
Grading by decrease in augite and general in- ge $5885 
creise in acidity, into 3 S242 SE5 
“8 2609 1 as 
on - r=] e2 68 
a 3 2 aS im og 
& ESS Heo ook 
mse soos MSs 
Baggee™ Soe 
: F HRASH 7SO 
Diabase-porphyrite (the larger part) (B 7). Grading by in- a Agotes g°s 
Tabular oligoclases. creasing amount Oates $2 gE 
Rannd augite particles. of uncrystalline| 3°35 aS 83 as = 
agnetite, base, and intro-| RRA SBE Fae 
Trresolvable base. duction of gas} .. Baws on 
Large porphyritie plagioclases and rarer vesicles, into—>| 8 ae8 sos 
augites. 3 Sok Seg 
§ a ze & ay 
eas os 
3 $42 525 
ae Sa> 
§ SAS a & 
oR x 
ae meena SND 
3 ¢ 
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* . . ss ea . 5 
Grading by increasing acidity of the feldspars, ~ = 
decrease in the amount of augite, and intro- 2 > 
duction of much ferritic matter, into : 3 
| * q 4 
=- nad 
BOe ska 
ace BOG 
. FY ‘. 4 iy = OS me 
Diabase-porphyrite (in part; especially the | Grading by in- we Seas 
reddish-brown and jet-black kinds with creasing amount 525% 
highly conchoidal fracture) (B 7). of unerystalline eae] 
base, and intro- ABA 
dnetion of gas} 
vesicles, into—>! 
the acid rocks. 
Vesicular kinds not known amo 
