Figure 7.16 Geologic cross section of the Algoma Mining District, Canadian Shield. This district is just north of the international boundary, about 480 km directly north of Detroit, Michigan. Based on the accompanying figure, answer each of the following statements as probable [P] or not probable [NP].Asc and As are not necessarily the same age, but both are younger than Br. ["", ""] Granite gneiss Gg is older than sediments Br. ["", ""] Granite Gr is younger than granite Gg, and perhaps younger than sediments Br. ["", "", "", ""] The last period of folding in the region was after the deposition of Co. ["", ""] A very long period of erosion intervened between the deposition of Asc and Br. ["", ""] **Geological Cross-section Analysis: Blind River Area**This diagram presents a geological cross-section from the Blind River Map, originally part of the Geologic Survey of Canada (1925). The various rock types and their compositions are illustrated along a horizontal stretch of 1 kilometer, reaching depths beyond 2000 meters.### Key to Rock Types:- **Co (Cobalt)**: Comprising quartzite, quartz conglomerate, limestone, and siltstone.- **Br (Bruce)**: Includes quartzite, conglomerate, limestone, siltstone, and arkose sandstone.- **Asc (Ascites)**: Originates from schist derived from basalt, occasionally featuring iron-rich chert.- **As (Ash)**: Consists of graywacke sandstone, sometimes altered to mica schist.- **Gg (Granite gneiss)**: Identified as granite gneiss.- **Gr (Granite)**: Simply granite.### Diagram Explanation:The cross-section visually conveys the arrangement and interaction of these rock layers, all dated to the Proterozoic era. At the surface and moving downward, the stratification and folding patterns are depicted, showcasing how different rock types overlay or intersect with one another.- The **Cobalt (Co)** and **Bruce (Br)** layers are evident at various sections, indicating significant surface exposure and folding. - **Ascites (Asc)** dominates a portion of the diagram, with a distinctive hatching pattern illustrating its spread and depth.- **Granite gneiss (Gg)** and **Granite (Gr)** appear at deeper levels, reflecting their foundational role in the geological history of the area.- The diagram highlights complex geological processes, including deposition, folding, and metamorphism, over vast geological timescales.This cross-section serves as an educational tool to understand the geological framework and the dynamic processes that have shaped this region's subsurface characteristics.

The relative age determination can be done by knowing following laws- The order of superposition- It…

Answered: Meters 0 -1000 - 2000 Co Br Asc As Gg…

Applications and Investigations in Earth Science (9th Edition)

9th Edition

ISBN:9780134746241

Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Chapter1: The Study Of Minerals

Section: Chapter Questions

Problem 1LR

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Question

Figure 7.16 Geologic cross section of the Algoma Mining District, Canadian Shield. This district is just north of the international boundary, about 480 km directly north of Detroit, Michigan.

Based on the accompanying figure, answer each of the following statements as probable [P] or not probable [NP].

Asc and As are not necessarily the same age, but both are younger than Br. ["", ""]

Granite gneiss Gg is older than sediments Br. ["", ""]

Granite Gr is younger than granite Gg, and perhaps younger than sediments Br. ["", "", "", ""]

The last period of folding in the region was after the deposition of Co. ["", ""]

A very long period of erosion intervened between the deposition of Asc and Br. ["", ""]

**Geological Cross-section Analysis: Blind River Area**

This diagram presents a geological cross-section from the Blind River Map, originally part of the Geologic Survey of Canada (1925). The various rock types and their compositions are illustrated along a horizontal stretch of 1 kilometer, reaching depths beyond 2000 meters.

### Key to Rock Types:

- **Co (Cobalt)**: Comprising quartzite, quartz conglomerate, limestone, and siltstone.
- **Br (Bruce)**: Includes quartzite, conglomerate, limestone, siltstone, and arkose sandstone.
- **Asc (Ascites)**: Originates from schist derived from basalt, occasionally featuring iron-rich chert.
- **As (Ash)**: Consists of graywacke sandstone, sometimes altered to mica schist.
- **Gg (Granite gneiss)**: Identified as granite gneiss.
- **Gr (Granite)**: Simply granite.

### Diagram Explanation:

The cross-section visually conveys the arrangement and interaction of these rock layers, all dated to the Proterozoic era. At the surface and moving downward, the stratification and folding patterns are depicted, showcasing how different rock types overlay or intersect with one another.

- The **Cobalt (Co)** and **Bruce (Br)** layers are evident at various sections, indicating significant surface exposure and folding.
- **Ascites (Asc)** dominates a portion of the diagram, with a distinctive hatching pattern illustrating its spread and depth.
- **Granite gneiss (Gg)** and **Granite (Gr)** appear at deeper levels, reflecting their foundational role in the geological history of the area.
- The diagram highlights complex geological processes, including deposition, folding, and metamorphism, over vast geological timescales.

This cross-section serves as an educational tool to understand the geological framework and the dynamic processes that have shaped this region's subsurface characteristics.

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