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For "A" what type of general rock is it? - Sedimentary, igneous, metamorphic? - Specific rock name?

For "A" what type of general rock is it? - Sedimentary, igneous, metamorphic? - Specific rock name?

Applications and Investigations in Earth Science (9th Edition)
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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For "A" what type of general rock is it? - Sedimentary, igneous, metamorphic?

- Specific rock name? 

### Geology and Stratigraphy: Diagram Explanation This diagram is a geological cross-section illustrating the relationships between different rock units and geological features. Below is a detailed transcription and explanation of the diagram's various components. #### Diagram Key: 1. **Contact Metamorphism**: - Represented by **dotted lines**. This indicates areas where the rocks have undergone changes in mineralogy and texture due to heat and chemically active fluids from nearby magma intrusions. 2. **Unconformity**: - Depicted by **wavy lines** (wiggly lines). These are surfaces that represent a gap in the geological record, often due to erosion or lack of deposition for an extended period. 3. **Marker Bed in Unit I**: - Denoted by **dash-dot-dot lines**. This bed serves as a reference point for correlation across different sections of the diagram. #### Rock Units: - **A, B, C, D, E, F, G, H, J, I**: - Labeled units denote different rock strata, which can be identified by their unique geological properties and history. The arrangement shows relative positions and thicknesses of these units over a horizontal distance. #### Distance and Scale: - **Horizontal Scale**: 1 unit corresponds to **200 meters**. - **Vertical Scale**: 1 unit corresponds to **800 meters**. #### Explanation of Geologic Features: 1. **Marker Units (A, B, C, D, E, F, G, H, J, I)**: - Each labeled unit consists of distinct layers of sedimentary or metamorphic rocks. The varying orientation of lines indicates the deformation these rocks have undergone. 2. **Contacts and Metamorphism**: - **Contact H**: Indicates an intrusion of metamorphic activity near Unit H, suggesting high-temperature alteration. - **Contact L**: Denotes the extent of metamorphism affecting Unit I, possibly due to intrusions or other thermal events. 3. **Unconformities**: - **K**: Marks an unconformity where there has been significant erosion or non-deposition, indicating a gap in the geologic time scale. ### Educational Context: This diagram is utilized for understanding the geological history of an area, mapping stratigraphic layers, investigating the causes of metamorphism, and recognizing hiatuses in deposition. Geologists analyze these features to piece together the history of Earth's crust in that
Transcribed Image Text:### Geology and Stratigraphy: Diagram Explanation This diagram is a geological cross-section illustrating the relationships between different rock units and geological features. Below is a detailed transcription and explanation of the diagram's various components. #### Diagram Key: 1. **Contact Metamorphism**: - Represented by **dotted lines**. This indicates areas where the rocks have undergone changes in mineralogy and texture due to heat and chemically active fluids from nearby magma intrusions. 2. **Unconformity**: - Depicted by **wavy lines** (wiggly lines). These are surfaces that represent a gap in the geological record, often due to erosion or lack of deposition for an extended period. 3. **Marker Bed in Unit I**: - Denoted by **dash-dot-dot lines**. This bed serves as a reference point for correlation across different sections of the diagram. #### Rock Units: - **A, B, C, D, E, F, G, H, J, I**: - Labeled units denote different rock strata, which can be identified by their unique geological properties and history. The arrangement shows relative positions and thicknesses of these units over a horizontal distance. #### Distance and Scale: - **Horizontal Scale**: 1 unit corresponds to **200 meters**. - **Vertical Scale**: 1 unit corresponds to **800 meters**. #### Explanation of Geologic Features: 1. **Marker Units (A, B, C, D, E, F, G, H, J, I)**: - Each labeled unit consists of distinct layers of sedimentary or metamorphic rocks. The varying orientation of lines indicates the deformation these rocks have undergone. 2. **Contacts and Metamorphism**: - **Contact H**: Indicates an intrusion of metamorphic activity near Unit H, suggesting high-temperature alteration. - **Contact L**: Denotes the extent of metamorphism affecting Unit I, possibly due to intrusions or other thermal events. 3. **Unconformities**: - **K**: Marks an unconformity where there has been significant erosion or non-deposition, indicating a gap in the geologic time scale. ### Educational Context: This diagram is utilized for understanding the geological history of an area, mapping stratigraphic layers, investigating the causes of metamorphism, and recognizing hiatuses in deposition. Geologists analyze these features to piece together the history of Earth's crust in that
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