11inh Quang Sang

28/03/2015Khong vt hc

TP ON DU KH VIT NAMTRNG I HC DU KH VIT NAM

Bi 4: HP TINH (Twins)

CBGD : inh Quang SangEmail : sangdq@pvu.edu.vnWebsite : www.pvu.edu.vn/sangdq

PHN 2: TINH TH HC

inh Quang Sang

a hp tinh albite ca Plagioclase

(010)(010)

(010

)(0

10)

(010)(010)

Mt ghp: (010)

Trc song tinh: (010)

a hp tinh albite

22inh Quang Sang

28/03/2015Khong vt hc

inh Quang Sang

HP TINH: hin tng 2 hoc nhiu tinh th cng loi cngkt tinh v c cng chung lin kt vi nhau.Nu ch c 2 tinh th lin kt vi nhau gi l Song tinh

(Twinning). V d song tinh ca thch anh, carlsbadNu s lng 3 tinh th hoc nhiu hn th ta gi l a

hp tinh (polysynthetic twins). V d a hp tinh caPlagioclas,

HP TINH (Twins)

inh Quang Sang

Mt song tinh (twin plane): l mt i xng gng ca 2 tinh th (TT ny trng lp vi nh ca TT kia).

Mt gn (Mt lin kt): l mt mng ca tinh th nyng thi l mt mng ca tinh th kia, 2 TT cng dngchung 1 mt. Nu b mt ny phng th gi l mt phnglin kt. Mt phng ny thng trng (nhng khng nhtthit) vi mt song tinh.

CC YU T CA HP TINH

33inh Quang Sang

28/03/2015Khong vt hc

inh Quang Sang

Trc song tinh (twin axis): l trc xoay tinh th nytrng c vi tinh th kia. Trc song tinh lun vung gcvi mt song tinh v thng c gc xoay 1800 (3600/n, n=2). Trc song tinh khng phi l trc i xng

Tm song tinh (twin centre): l 1 im i xng ca ccc th

CC YU T CA HP TINH

inh Quang Sang

1. HP TINH TIP XC (Contact Twins) - l mtmng ca tinh th ny ng thi l mt mng catinh th kia, 2 TT cng dng chung 1 mt

V d: Khong Orthoclase c Lut song tinh Bravenovi mt tip xc l h mt {021}; v h mt {001}theoLut song tinh Manebach

CC LOI HP TINH(Types of Twinning)

44inh Quang Sang

28/03/2015Khong vt hc

inh Quang Sang

Song tinh mc xen (Penetration Twins) khng dngchung mt mng, tuy nhin chng c xc nh bi tmhoc trc song tinh.V d: Khong vt Orthoclase nhn trc [001] lm trc song tinh theo lut song tinh Carlsbad, v trc song tinh [111] lm trc song tinh ca khong Flourite

2 - LOI SONG TINH MC XEN

inh Quang Sang

Mt lin kt

Trc Song tinh

CC LOI HP TINH

55inh Quang Sang

28/03/2015Khong vt hc

inh Quang Sang

NGUN GC CA SONG TINH(Origin of Twinning)

S pht trin ca tinh th (Growth Twins)

Song tinh hnh thnh sau chuyn pha (Transformation Twins)

Song tinh sinh ra do lc c hc lm tinh th bin dng(Deformation/Gliding Twins)

inh Quang Sang

Song tinh ca Flourite

66inh Quang Sang

28/03/2015Khong vt hc

inh Quang Sang

Song tinh ca thch anh

inh Quang Sang

Song tinh cnhbm ca calcite

Song tinh cnh n ca thch cao

Staurolite

77inh Quang Sang

28/03/2015Khong vt hc

inh Quang Sang

HP TINH H 1 NGHING

inh Quang Sang

HP TINH H TRC THOI

88inh Quang Sang

28/03/2015Khong vt hc

inh Quang Sang

HP TINH H 4 PHNG

inh Quang Sang

HP TINH H 3 & 6 PHNG

99inh Quang Sang

28/03/2015Khong vt hc

inh Quang Sang

HP TINH H LP PHNG

inh Quang Sang

GC TT

Gc tt c to bi mt phng dao ng xc nh ca mt quang sut (phng dao ng tinh th) vi mt phng c trng ca tinh th (ct khai, trc tinh th, mt tinh th)

n

n a=X

c=Z

b=Y

c

a

b

Z

X

Y

Tt thng (ng) Tt nghing (xin)

1010inh Quang Sang

28/03/2015Khong vt hc

inh Quang Sang

Quang hc tinh th (Quang tinh)(Mineral optics)

ng hng quang hc (isotropic): AS truyn qua tinh thcho mt i lng chit sut (ni) khng i theo miphng. Khong vt ti en di 2 nicol.

Vt cht v nh hnh (Opal, thy tinh, than )

Tinh th h lp phng (garnet(garnet)

D hng quang hc (anisotropic): AS truyn qua tinh ths b phn cc thnh 1 hoc 2 phng truyn.

Khong c 1 phng truyn sng: Khong mt trcquang

Khong c 2 phng truyn sng: Khong hai trc quang

inh Quang Sang

QUAN ST TINH TH DI 2 Ni+

Hu ht cc ht khong vt thay i khi xoay bn knh 360, v chnh xc l 90o

Cc khong vt ny gi l khong vt d hng

quang hc

Cc khong vt ny gi l khong vt ng hng quang hc

Thy tinh & mt s KV vnti en khi xoay

bn knh

1111inh Quang Sang

28/03/2015Khong vt hc

inh Quang Sang

CC I LNG QUANG HC

ni: Phng dao ng. no: Vt cht v nh hnh (Opal, thy tinh, than ), v tinh

th h lp phng (garnet,(garnet, spinelspinel)

ne, no: Khong 1 trc quang ((thchthch anhanh,, berylberyl)

ng, nm, np: Khong 2 trc quang (pyroxene,(pyroxene, olivineolivine)

Trc quang (optic axis): c Khong 1 trc

Mt quang trc (optic axis plane): 2V Khong 2 trc

inh Quang Sang

Phng daong AS

AS t nhin

Phng daong AS saukhi qua LM

AS v munhn thydi knh

Quan st lt mng di 2 nicol +

Nicol PP Nicol AA

Ngun sng

1212inh Quang Sang

28/03/2015Khong vt hc

inh Quang Sang

c im song tinh ca khong vt quan st di 2 nicol vung gc

Song tinh di knh hin vi thch hc

inh Quang Sang

Song tinh di knh hin vi thch hcc im song tinh ca khong vt Orthoclase, microcline & plagioclase