Shatter cones from impact structures worldwide

Shatter cones in fine-grained sedimentary rocks – limestones, dolomites

Crooked creek impact crater (Missouri, USA)

well developed shatter cones in dolomite, Crooked Creek impact crater

Fig. 1. Shatter cones in dolostone from the Crooked Creek impact structure (Missouri, USA). Due to rock inhomogeneities, individual, complete cones as shown here are rarely developed.

multiple shatter cone fracturing in dolostone, Crooked Creek crater

Fig. 2. Multiple shatter coning in dolostone, Crooked Creek impact crater, Missouri.

Fig. 3. Shatter cones in dolomite, Crooked Creek impact crater.

Fig. 4. Shatter coning in dolomite; Crooked Creek impact structure (Missouri).

 

Kentland (Indiana, USA) shatter cone

Fig. 5. Shatter cone in limestone, Kentland (Indiana, USA) impact structure.

 

Wells Creek (Tennessee, USA) shatter cones

set of multiple shatter cones in dolomite, Wells Creek impact crater

Fig. 6. Shatter cones in dolomite, Wells Creek (Tennessee, USA) impact structure. Similar cone setting like in Fig. 26 (Rochechouart shatter cones).

 

Steinheim basin (Germany) shatter cones

multiple shatter coning in Malmian limestone; Steinheim impact crater, GermanyFig. 7. Shatter coning in Malmian limestone; Steinheim (Germany) impact structure.

individual shatter cone frustum, Malmian limestone, Steinheim impact crater

Fig. 8. Truncated shatter cone in Malmian Limestone; Steinheim Basin (Germany) impact crater.

perfect cone fracture surface of a shatter cone, Steinheim craterFig. 8-1. Perfect conical fracture surface of a shatter cone. Steinheim impact crater, Malmian limestone.

counter shatter cones, limestone, Steinheim BasinFig. 9. Counter shatter cones (positive and negative) in Malmian limestone; Steinheim Basin impact structure.

complex setting of positive and negative shatter conesFig. 10. Shatter coning in Jurassic limestone from the Steinheim impact structure (Germany). Note the negative cone fracture terminating at the positive cone – or vice versa.

shatter cone with fossil starting point, Steinheim impact craterFig. 11. Shatter cone from the Steinheim impact structure (Germany); Jurassic fossiliferous limestone. Note the fossil as the starting point of the shatter-cone fracture.

 

Shatter cones in coarser-grained sedimentary rock – sandstones

Beaverhead impact structure Montana USA)


shatter con in sandstone, Beaverhead impactFig. 12. Shatter coning in sandstone; Beaverhead (Montana, USA) impact structure.

 

Shatter cones Tüttensee crater, Chiemgau impact crater strewn field

counter shatter coning, sandstone, Lake Tüttensee crater, Chiemgau impact

Fig. 13. Two shatter cones in counter orientation. Tüttensee crater, Chiemgau impact (Germany). Fine-grained sandstone. More may be read HERE.

 

Shatter cones in quartzitic rocks

Siljan ring impact structure (Sweden)

Fig. 14. Shatter cone from the Siljan (Sweden) impact structure; quartzite.

shatter cones in quartzitic rock, Siljan ring impact structure, Sweden

Fig. 14-1. Shatter cones, Siljan ring (Sweden) impact structure; quartzitic rock. Sample by courtesy of P. Bockstaller.

 

Vredefort (South Africa) shatter cones

shatter cones in arenite, Vredefort impact structure, South AfricaFig. 15. Shatter cones from the Vredefort impact structure (South Africa); arenite. 

quartzite shatter cone, Vredefort impact structure, South AfricaFig. 16. Shatter cone from the Vredefort impact structure (South Africa); quartzite.

 

 Sudbury (Canada) shatter cones  

shatter cone, arenite, Sudbury impact structureFig. 17. Shatter cone from the Sudbury impact structure (Canada); arenite.

shatter cone, quartz arenite, Sudbury impact structure, Canadaig. 18. Shatter cone from the Sudbury impact structure (Canada); quartz arenite.

crude shatter coning in arenite, Sudbury impact structure, CanadaFig. 19. Relatively crude shatter coning in arenite from the Sudbury impact structure (Canada).

 

Shatter cones in crystalline rock

Rochechouart (France) shatter cones

shatter cones in subvolcanic dike rock, Rochechouart impact structure, FranceFig. 20. Shatter cones from the Rochechouart impact structure (France); subvolcanic dike.

individual shatter cone in subvolcanic dike rock, Rochechouart impact structure, FranceFig. 21. Individual larger shatter cone from the Rochechouart impact structure (France); subvolcanic dike rock.

shatter cone fragment in gneiss; Rochechouart impact structure, FranceFig. 22. Shatter cone from the Rochechouart impact structure (France); single-cone fragment, gneiss.

shatter cones in outcrop, granitic rock, Rochechouart impactFig. 23. Multiple shatter coning in granitic rock; Rochechouart impact structure, France.

individual large shatter cone, granite, Rochechouart impactFig. 24. Large shatter cone, granite, Rochechouart impact structure.

shatter cone fragment, granite; Rochechouart impactFig. 25. Shatter cone from the Rochechouart impact structure (France); granite.

multiple shatter cones riding on each otherFig. 26. Shatter cones from the Rochechouart impact structure (France); granite. Note the small cones riding on each other. Compare a similar setting in Fig. 6 (Wells Creek shatter cones).

shatter cones degenerated into cleavage, paragneiss, Rochechouart impactFig. 27. Shatter cones degenerated into shatter cleavage. Paragneiss, Rochechouart impact structure (France).

shatter cleavage in shocked quartzite cobbles, Azuara/Rubielos da la Cérida impact structures, SpainFig. 27-1. For comparison: shatter cleavage in quartzite, Azuara/Rubielos de la Cérida impacts, Spain. Few horsetail markings have developed more or less in a fracture plane. Sample by courtesy of P. Bockstaller.

 

Siljan ring (Sweden) shatter coning

Fig. 27-2. Shatter coning in granitic rock; Siljan ring impact structure (Sweden). Sample by courtesy of P. Bockstaller

Suvasvesi South (Finland) shatter cone 

shatter cone in granitoid, Suvasvesi South impact structure; FinlandFig. 28. Shatter coning in granitoid; Suvasvesi South impact structure (Finland).

 

 Keurusselkä (Finland) shatter cone

granodiorite shatter coning, Keurusselkä impact structure, FinlandFig. 29. Shatter coning in granodiorite, Keurusselkä (Finland) impact structure.

 

Ries crater (Germany) shatter cones

shatter cones in granitoid, sampled from the Bunte breccia ejecta, Ronheim quarry, Ries craterFig. 30. Shatter cone from the Ries impact structure (Germany); granitoid rock from the Bunte breccia ejecta (Ronheim quarry).

shatter cone from the Wengenhausen outcrop, Ries crater; hornblende kersantiteFig. 31. Shatter cone from the Ries impact structure (Germany); hornblende kersantite, inner ring.

shatter coning in granite, Ries craterFig. 32. Shatter coning in granite, Ries impact structure.

strung shatter coning in hornblende kersantite, Wengenhausen, Ries craterFig. 33. Strung shatter coning in kersantite, Wengenhausen outcrop, Ries crater.

Karrikoselkä (Finland) shatter cones

poorly developed shatter cone in granite; Karrikoselkä impact structure, FinlandFig. 34. Poorly developed shatter cones from the Karrikoselkä (Finland) impact structure; granite.

 

 Saarijärvi (Finland shatter cones

shatter cones in granite, Saarijärvi impact structure, FinlandFig. 35. Shatter coning in granite from the Saarijärvi (Finland) impact structure.

 

Fig. 36 – 38. Shatter cones from the Santa Fe impact structure, New Mexico, USA (photos courtesy of Tim McElvain)

shatter coning in fine-grained granitic rock Santa Fe impact structureFig. 36. Fine-grained granitic rock. See the hammer as scale for the large cones.

large shatter cone in fine-grained schist Santa Fe, New Mexico, impact structureFig. 37. Shatter cone in a fine-grained quartz/hornblende/biotite schist.

shatter cones in fine-grained granitoid Santa Fe impact structure, New MexicoFig. 38. Santa Fe shatter cone in a fine-grained granitoid.