Observations géologiques en Corse. 1, Le Razzo Bianco près de Venaco

(1)

Article

Reference

Observations géologiques en Corse. 1, Le Razzo Bianco près de Venaco

PARÉJAS, Edouard

PARÉJAS, Edouard. Observations géologiques en Corse. 1, Le Razzo Bianco près de Venaco.

Compte rendu des séances de la Société de physique et d'histoire naturelle de Genève, 1929, vol. 46, no. 1, p. 13-17

DOI : 10.5169/SEALS-740997

Available at:

http://archive-ouverte.unige.ch/unige:137299

Disclaimer: layout of this document may differ from the published version.

1 / 1

(2)

6pDQFH GX

IpYULHU

(G 3DUpMDV

²

2IHHUHDI]R.V JpRORJLTXHV

P

^&RUVH ^/H ^LID]]R

="LD©FR S"qV UIH (HZDFR

/D ERUGXUH RULHQWDOH GH OD &RUVH

FULVWDOOLQH

HVW MDORQQpH

SDU

XQH ^VpULH GDIIOHXUHPHQWV GH FDOFDLUHV HW ^GH PDUEUHV

GRQW

OkJH HW ^OH U{OH WHFWRQLTXH VRQW HQFRUH GLVFXWpV

3DUPL

FHV

SRLQWH

PHQWV ILJXUH FHOXL ^{GX 5D]]R} %LDQFR VLWXp DX 6: ^GH 9HQDFR

/

' +ROODQGH S HW (

0DXU\

FRQVLGqUHQW ^OHV PDUEUHV GX 5D]]R %LDQFR FRPPH FUpWDFpV 5pFHPPHQW ³

7HUPLHU

HW (

0DXU\

^OHV HQJOREqUHQW

MXVTXj

SOXV DPSOH LQIRUPp GDQV OH FRPSOH[H SDOpR]RwTXH ^GHV ©URFKHV EUXQHVª LOV VHUDLHQW

SDU

FH

IDLW

DQWpULHXUV DX JUDQLWH ⁵ ^6WDXE S

YRLW

^GDQV

OHV PDUEUHV

TXL

DIIOHXUHQW HQWUH 9HQDFR HW &RUWH ^GHV GpS{WV MXUDVVLTXHV

,O

^D ^REVHUYp ^HQ ^FHUWDLQV SRLQWV ^j OD EDVH GH FHX[FL

GHV GRORPLHV HW ^GHV ^EUqFKHV ELJDUUpHV TXL GDSUqV

OXL

^QH SHXYHQW

DSSDUWHQLU

TXDX 7ULDV

J'

^+ROODQGH ^ILJ ^Q ^D ^QRWp ^DX ^5D]]R ^%LDQFR ^XQH

VXFFHVVLRQ GH WHUUDLQV TXL FRQFRUGH GDQV ^OHV JUDQGHV OLJQHV DYHF FHOOH _TXH

MDL

^PRLPrPH ^REVHUYpH

'H

O:

^j

O(

RQ

YRLW

IOJ ,

*UDQLWH DXWRFLvRUHH 6D VXUIDFH VXSpULHXUH SHXW ^{rWUH WUqV} IUDvFKH PDLV PRQWUH ORFDOHPHQW XQH GpFRPSRVLWLRQ DUqQHV UXEpIDFWLRQ QLGV GR[\GH ^GH IHU TXL UDSSHOOHUDLW OD ]RQH GDOWpUDWLRQ SHUPLHQQH

GHV $LJXLOOHV 5RXJHV ^GH &KDPRQL[ HW GX PDVVLI ^GH *DVWHUQ OD /D VXUIDFH GH FRQWDFW HQWUH JUDQLWH HW FDOFDLUH HVW PpFDQLTXH HW PRQWUH XQH RQGXODWLRQ WUqV QHWWH $XGHVVRXV GX FKHPLQ GH 9HQDFR OH SORQJHPHQW ^HVW ^GH HQYLURQ YHUV O( $X QLYHDX ^GH OD PDLVRQ YRLVLQH GH OD FDUULqUH ^OH FRQWDFW GHYLHQW KRUL]RQWDO HW VLQFOLQH IDLEOHPHQW YHUV

O:

(QILQ HOOH VH UHOqYH WUqV IRUWHPHQW DYDQW ^GH VH

SHUGUH VRXV OHV pERXOLV /HV FDOFDLUHV RQW pWp SRXVVpV VXU ^OH JUDQLWH

GH

O(

^j O:

/HV FDOFDLUHV GH 9HQDFR VRQW SOXV pWHQGXV TXH OD FDUWH QH

OLQGLTXH ^LOV ^VH SRXUVXLYHQW YHUV ^OH

1:

^HQWUH ^OH JUDQLWH ^HW ^OHV SRXGLQJXHV ^GDQV OD GLUHFWLRQ GX 3 R QRXV QDYRQV _SDV HX OH

ORLVLU ^{GH OHV} VXLYUH

(3)

ODPEHDX GH FDOFDLUH FULV,D0LQ _URVH SDUWLFXOLqUHPHQW P\ORQLWLVp

$ PLKDXWHXU HQWUH OH FKHPLQ HW OH VRPPHW GX 5D]]R %LDQFR HW ^j RX P WOX FULVWDOOLQ VLQWHUFDOHQW GHV pOpPHQWV pWUDQJHUV ^VRXV IRUPH ^GH EORFV ODPLQpV GH VFKLVWHV YHUWV HW ^GH JUDQLWH OXQ ^GHX[

PHVXUH PGH ORQJXHXU

,O

^VHQ WURXYH DXVVL SUqV ^GH OD PDLVRQ

&H VRQW ^OHV PAORQLWHVJ

VLJQDOpHV SDU ³ 7HUPLHU HW ( 0DXU\

/D PDVVH SULQFLSDOH GX 5D]]R %LDQFR HVW IRUPpH GXQ ^FDOFDLUH PDUPRULVp EOHXWp ODUJHPHQW FULVWDOOLVp

&RQJORPpUDW _GH _qDVH SRO\JpQLTXH ^j pOpPHQWV FULVWDOOLQV HW FDOFDLUHV

&HWWH IRUPDWLRQ QH VH GLVWLQJXH ^GH ^OD VXLYDQWH _TXH SDU ^XQ ODPLQDJH WHFWRKLTXH LQWHQVH (OOH HVW YLVLEOH DX YRLVLQDJH GXQS

IRXU

j FKDX[ HW UHSUpVHQWH YUDLVHPEODEOHPHQW OD WUDQVJUHVVLRQ QXPPX OLWLTXH P

&RQJORPpUDW PRLQV DOWpUp GXQH SXLVVDQFH ^GH P HQYLURQ /HV pOpPHQWV FDOFDLUHV SUpGRPLQHQW GDERUG SXLV ^OHV JDOHWV FULVWDOOLQV SUHQQHQWOH SDV XQ EORF GH P ^D pWp PHVXUp /H FLPHQW GHYLHQW DUJLOHX[ HW PLEDFp HW ORQ SDVVH j

$UJLOHV JUpVHXVHV PLFDFpHV WUqV FRPSDUDEOHV ^j FHUWDLQV IDFLqV GX )O\VFK KHOYpWLTXH ^j P

$OWHUQDQFHV UpSpWpHV VXU XQH YLQJWDLQH ^GH P ^GH EDQFV GH SRXGLQJXHV ^j pOpPHQWV FDOFDLUHV HW FLPHQW JUpVHX[ DYHF ^GHV JUqV VFKLVWHX[

*UqV HW SRMDGLQJQHV PDVVLV ^GH )HQDFR /HXU kJH HVW WUqV SURED EOHPHQW WHUWLDLUH _SRXU ³ 7HUPLHU HW ( 0DXU\ QXPPXOLWLTXH SRXU ^' +ROODTGH HW 5 6WDXE

/HQVHPEOH GH OD VpULH pODVWLTXH ^GH ^9HQDFR ^D ^VXEL XQ G\QDPR PpWDPRUSKLVPH ^DXVVL ^LQWHQVH _TXH FHOXL pSURXYp SDU ^OHV ^FDOFDLUHV VRXVMDFHQWV /HV pOpPHQWV FDOFDLUHV LQFOXV GDQV OHV SRXGLQJXHV

j

SDUWLU

^GH SUpVHQWHQW VRXYHQW XQH

UHFULVWDOOLVDWLRQ

^ILEUHXVH

GH OD FDOFLWH _ILJ 9 ^/HV SODJHV ^GH FH

PLQpUDO

VRQW DOORQJpHV QRUPDOHPHQW DX[ SODQV ^GH JOLVVHPHQW ^GH ODURFKH &HWWH

WH[WXUH

VLJQDOpH

SDU

³

7HUPLHU

HW (

0DXU\

^PH

SDUDvW VXUWRXW

^GXH

j OD IOXHQFH

UHODWLYH

^GHV GLYHUV

OLWV

(OOH HVW SRVWpULHXUH DX GpS{W FHVWjGLUH HQ

UHODWLRQ

DYHF ^OH SOLVVHPHQW DOSLQ ^VL ^OHV SRXGLQJXHV VRQW

QXPPXOLWLTXHV

^{2U FHWWH}

WH[WXUH

HVW UpDOLVpH VXU ^GH JUDQGHV pSDLVVHXUV GDQV ^OHV FDOFDLUHV GX 5D]]R %LDQFR

,O

^VHPEOH ^GqV ORUV SHUPLV ^GH

PHWWUH

pJDOHPHQW OD

PDUPRUL

VDWLRQ GH FHV GHUQLHUV _HQ

UHODWLRQ

DYHF OD _SRXVVpH _RURJpQLTXH DOSLQH ^6L OD

FULVWDOOLQLWp

GH _FHV PDUEUHV HW ^GH FHX[ WUqV VHP EODEOHV ^GHV HQYLURQV ^GH &RUWH GDWH ELHQ GX

7HUWLDLUH ODWWULEX

(4)

)LJ , /H 5D]]R %LDQFR YX ^GX ⁶ ² )LJ

,,

^HW

,,,

0\ORQLWH ^FDO FDLUH Q _JURVV ² )LJ ,9 0DUEUH GX 5D]]R %LDQFR ^j WH[WXUH ILEUHXVH (Q QRLU WUDvQpH DUJLOHXVH PDUTXDQW OD VWUD WLILFDWLRQ ^*URVV ² )LJ 9 &RQJORPpUDW SRO\JpQLTXH ^pFUDVp Q PRQWUDQW ^OD WH[WXUH ILEUHXVH GHV pOpPHQWV FDOFDLUHV /HV pOp PHQWV FULVWDOOLQV VRQW _HQ _JULVp 5pGXFWLRQ

(5)

/pWXGH

^GH GHX[ _FRXSHV PLQFHV GHV FDOFDLUHV GX 5D]]R

%LDQFR YD QRXV

IRXUQLU

TXHOTXHV SUpFLVLRQV ^GH SOXV

/D

_SUHPLqUH

PRQWUH

OD QDWXUH ^GH OD

WH[WXUH

ILEUHXVH ILJ

,9

^&H ^VRQW ^GH JUDQGHV SODJHV GH FDOFLWH DOORQJpHV SOXV RX PRLQV QRUPDOHPHQW

j ODQFLHQQH

VWUDWLILFDWLRQ

'H FHWWH GHUQLqUH

LO

QH UHVWH TXH GHV WUDvQpHV DUJLOHXVHV SDUDOOqOHV

/D

PDWLqUH DUJLOHXVH UpVL GXHOOH V\ SUpVHQWH HQ DOLJQHPHQWV ^GH SHORWHV ^LVROpHV RX HQ PDVVHV PULIRUPHV _DOORQJpHV

/D

VLOLFH H[LVWH VRXV IRUPH ^GH JUDLQV ^GH

TXDUW] SHWLWV

^HW ^UDUHV ^GLDPqWUH ^GH

ORUGUH

GH PP

/D

VHFRQGH

SUpSDUDWLRQ SURYLHQW

^GH ^OD

P\ORQLWH

^FDOFDLUH ^URVH Q VLWXpH DX YRLVLQDJH GX JUDQLWH

/D VWUXFWXUH

HVW

QHWWHPHQW

FDWDFODVWLTXH &RPPH GDQV OH[HPSOH SUpFpGHQW ^OH FDOFDLUH

RULJLQHO

^VHVW PDUPRULVp HQ JUDQGHV SODJHV HW FHW pSLVRGH HVW SUREDEOHPHQW GkJH DOSLQ ^3OXV

WDUG

^FHWWH

VWUXFWXUH

^VHFRQGDLUH

D pWp pFUDVpH

SDU

^OH JOLVVHPHQW GX FRPSOH[H 5D]]R %LDQFR 9HQDFR VXU ^OH JUDQLWH

/D GLVORFDWLRQ

^GHV pOpPHQWV FDOFLWLTXHV

VH

IDLW

VRXYHQW

SDU

^OH ^MHX ^GHV ^FOLYDJHV TXL VpODUJLVVHQW ILJ

,,

/HV _SODJHV VH JDXFKLVVHQW FH

TXL

^VH _{PDUTXH SDU} ^GHV

H[WLQFWLRQV

RQGXOHXVHV VH

IDLOOHQW

^J

,,,

^OHV ^FRQWRXUV

FULVWDOOLQV

VLQ

FXUUHQW

HW

OLQGLYLGX

pFODWH

OLWWpUDOHPHQW

HQ VH UpVROYDQW HQ IUDJPHQWV ^GH WRXWHV GLPHQVLRQV /H

FLPHQW

UHQGX HQ JULVp GDQV OHV GHVVLQV

,,

^HW

,,,

^{HVW HQ} ^UpDOLWp ^OH

^SURGXLW ^XOWLPH

^GH

OD

WULWXUDWLRQ ,O ^IDXW

^QRWHU ^HQFRUH TXDXFXQH

UHFULVWDOOLVDWLRQ

QHVW LQWHUYHQXH DSUqV FHWWH GHUQLqUH GLVORFDWLRQ

/D

VLOLFH HVW SHX DERQGDQWH VRXV IRUPH ^GH JUDLQV ^GH

TXDUW]

^FRUURGpV

&HUWDLQHV SODJHV VRQW VHFRQGDLUHV ^HOOHV UHQIHUPHQW ^GHV UpVLGXV GH FDOFLWH HW

PRQWUHQW

SDUIRLV XQH

VWUXFWXUH

GDJJUpJDW

,O

^UpVXOWH ^GH ^FH TXL ^SUpFqGH TXH SRVWpULHXUHPHQW ^j OHXU GpS{W

OHV FDOFDLUHV GX 5D]]R %LDQFR

RQW

pWp PRGLILpV DX PRLQV ^j GHX[ _UHSULVHV

$

OD SUHPLqUH SKDVH FRUUHVSRQG OD _ODUJH

FULVWDO

OLVDWLRQ

^GHV PDUEUHV OHXU

WH[WXUH

ILEUHXVH HW FHWWH ^UHPLVH HQ PRXYHPHQW ^GH OD FDOFLWH HVW GXH j XQH SUHVVLRQ WUDQVPLVH SDUDOOqOHPHQW ^jOD

VWUDWLILFDWLRQ

&HWWH SUHVVLRQ ^HVW WUqV SUREDEOH PHQW HQ

UHODWLRQ

DYHF ^OH SDUR[\VPH

SULQFLSDO

GX SOLVVHPHQW DOSLQ

$

OD VHFRQGH SKDVH HVW G OpFUDVHPHQW ^GH OD

VWUXFWXUH

SUpFpGHQWH ORUV GX JOLVVHPHQW ^GH

WRXW

^OH FRPSOH[H VXU^OH

JUDQLWH

(6)

HOOH PDUTXH XQH UHSULVH DWWpQXpH _{HW SOXV}

WDUGLYH

^GH ^OD SRXVVpH RURJpQLTXH

2XYUDJHV FLWpV

'

+ROODQGH

*pRORJLH ^GH OD &RUVH

%XOO

^{6RF 6F} KLVW HW QDW ^GH OD &RUVH %DVWLD

;;;9

DQQpH *UHQREOH

$OOLHU

IUqUHV

&DUWH JpRORJLTXH DX IHXLOOH &RUWH 7HUUDLQV VpGLPHQWDLUHV SDU ⁽ 0DXU\

3

7HUPLHU

^{HW (}

0DXU\

^$RDHHOOHV RqVHUHDOLRUHV FODQV OD

&RUVH 2ULHQWDOH & 5 $FDG ^6H 3DULV

W

_S

DYULO

PDL

5

6WDXE

^=!HU =OHF HUHqDD ;RUVL DV DQG VHLQ =DVDPQHQ

©DQJ

PLW

_$OSHQ DQG $SHQQLQ

9LHUWHOMVFKU

^G

1DWXUI

*HV =XULFK

/;;,,,

LDRUDWRLUH ^GH *HRORJLH ^GH =2XHHUVLvp GH *HQqRH

5 :DYUH ² pIQU QQH QRDHHOOH PpW$RGH HQ JpRGpVLHVDSpULHDUH 'DQV SOXVLHXUV ^QRWHV DQWpULHXUHV _QRXV DYRQV H[SRVp TXHOTXHV UpVXOWDWV JpQpUDX[ QRXYHDX[^j QRWUH FRQQDLVVDQFH

SRXU OpWXGH

GHV ILJXUHV

GpTXLOLEUH

^GXQH PDVVH IOXLGH KpWpURJqQH

GRQW

^OHV GLIIpUHQWHV SDUWLFXOHV

VDWWLUHQW VXLYDQW

OD

ORL

^GH 1HZWRQ

1RWUH

PpWKRGH FRQVLVWH HVVHQWLHOOHPHQW ^j _VpSDUHU ^OHV FRQGLWLRQV UHOD WLYHV j

OLQWpULHXU

GH

ODVWUH

TXL ^VH

WUDGXLVHQW

_SDU XQH pTXDWLRQ

GLIIpUHQWLHOOH

^HW ^OHV FRQGLWLRQV UHODWLYHV j OD VXUIDFH OLEUH ^&HV GHUQLqUHV

VH[SULPHQW

_SDU ^GHX[ UHODWLRQV LQWpJUDOHV

6L

ORQ

FRQVLGqUH XQH SODQqWH ^GH IDLEOH DSODWLVVHPHQW OD ^UHOD

WLRQ GLIIpUHQWLHOOH

GRQQH _HQ SUHPLqUH

DSSUR[LPDWLRQ OpTXDWLRQ

GH

&ODLUDXW5DGDX UHODWLYH

j OD JpRGpVLH FRPPH QRXV ODYRQV

PRQWUp

^GDQV QRWUH GHUQLqUH QRWH K

1RXV DOORQV IDLUH

YRLU

LFL VRPPDLUHPHQW TXH ^OHV GHX[

UHODWLRQV LQWpJUDOHV

SHUPHWWHQW

^GH ^FRRUGRQQHU ^TXHOTXHV ^UpVXOWDWV FODVVLTXHV HW GHQ

REWHQLU

^GH _QRXYHDX[

6RLHQW ⁶ OD VXUIDFH

OLEUH 7

^OH YROXPH 0 OD PDVVH

WRWDOH

P OD YLWHVVH DQJXODLUH GXQH SODQqWH 6RLHQW HQFRUH ⁼ OD GLVWDQFH GXQH

SDUWLFXOH

^j OD[H SRODLUH

U

^OD ^GLVWDQFH

GXQ SRLQW

SRWHQWLp

L

^& 5 6RF SK\V ^*HQqYH 9RO Q DRWGpFHPEUH

S

*5 6RF SK\V *HQqYH YRO